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This page contains conjecture or inductive logic about a subject that is not explicitly mentioned or explained in the canon.
A list of Supernatural inconsistencies that have occurred during its run.
- When an angel was killed, burnt wings would be appear on the ground next to the body. Beginning in Season 9, this effect was no longer used as all of the angels wings burnt off during the fall. However, in Meta Fiction many dead angels can be still be seen with their burnt broken wings. This affect wasn't seen again until Season 12 in Lily Sunder Has Some Regrets.
- The arrival of angels in 2009 sparked concern for the demons as angels had not officially been on Earth for maybe thousands of years. Anna Milton stated that her own garrison was forced to watch humans and not interact with them. Castiel stated to Dean that angels did not walk among humans for 2,000 years prior to Dean's resurrection. However, in Lily Sunder Has Some Regrets, it is revealed there was an angel garrison permitted to be on Earth only about 100 years ago and Castiel was a member of this garrison before joining Anna's. This was cleared up after Castiel mentioned the special circumstances surrounding the situation, calling it an "anomaly". Nevertheless, in Angel Heart Castiel mentions that the Grigori were stationed on Earth for centuries. The Nephilim Jane also existed on Earth for years without Heaven being aware.
- In Tombstone, Castiel is not able to resurrect a Security Guard, despite the fact that Seraphim can resurrect humans easily. The explanation can't be the loss of his wings, since Gadreel resurrected both Castiel and Charlie Bradbury, after the Fall, but it could be because he only reattained a fraction of what was left of his grace. Castiel was also unable to resurrect Sam in Beat the Devil. While he could resurrect Jack in Byzantium, it was stated that he could only bring Jack back for a few moments and could not heal the illness that killed him. It took a ritual curing the illness to make the resurrection permanent.
- In Hell's Angel, Amara refers to Lucifer as the "first son", which is inconsistent with statements made by Michael and Lucifer throughout season 5, in which Michael is the first son and Lucifer is the second. It is unclear why Amara said this.
- In Free To Be You and Me, it was explained that after an Archangel leaves his vessel, the vessel becomes paralyzed or worse. This depends on the archangel's strength as Castiel said: "Michael is much more powerful. It'll be far worse for you" to Dean. However, in LOTUS, after Lucifer was exorcised from Jefferson Rooney, the president was alive and healthy though he was only possessed for a few days. However, this may be intentional on the archangels' part, as Michael would later tell Dean that he wouldn't be a "drooling mess" after he's finished using him. During the alternate Michael's possession of Dean, Sam worried that Dean might end up being burned out. When Michael left him, Dean was clearly weak but otherwise ended up being okay.
- In Unfinished Business, Gabriel was seen sleeping in a flashback sequence, but as an angel, he shouldn't need to sleep.
- In Devil's Bargain, a weakened Lucifer stated the angels couldn't kill him if they tried. However, a similarly weakened Gabriel is shown running from Michael's angels in Exodus. Although, Gabriel was in a far weaker state than Lucifer as Asmodeus took grace from Gabriel for years.
- In My Bloody Valentine, Castiel consumes hundreds of hamburgers and a tray of raw meat due to the influence of Famine. He tells Dean that the burgers make him "very happy" and his facial expressions imply that he finds they taste delicious. However, in First Born, Castiel complains that by becoming an angel again, he has lost the ability to taste food like a human, and a sandwich tastes like "molecules" to him. On a side note, if angels could not taste food like humans, then every drink and snack would taste like molecules, in other words, "disgusting", yet Gabriel and Balthazar are shown consuming human foods with no trouble in the taste as did Alternate Michael, who has consumed cognac without problem in Gods and Monsters.
- During Reichenbach, Castiel is shown sleeping, when angels do not require sleep.
- It was stated before in the series that only Nadia's Codex could break the code from the Book of the Damned, however, in the episode Absence, Jack Kline was able to read the book and cast the spell "Necromancy" without the codex.
- Azazel is a Prince of Hell, a yellow-eyed demon who proves himself immune to holy water, and it is even suggested that Lilith has a resistance, if not immunity, to holy water.  However, later, it is proven that holy water can harm another white-eyed demon, Alastair, one of the strongest and most resistant demons. 
- Dagon a Prince of Hell kills multiple angels , but according to Alastair, neither Lilith nor himself can instantly kill angels, even if they so wish. 
- The powerful Prince of Hell Ramiel shows immunity to the Devil's Trap Bullets and even runs over the Devil's trap (object),  but the white-eyed and first demon Lilith has to destroy the devil trap and free himself from the devil traps.
- It contradicts itself that a Prince of Hell like Dagon can kill angels, but not the first demon Lilith created by Lucifer most personally or that Azazel proves immunity to holy water, but not the white-eyed demon Alastair, although the white-eyed demons have been shown to have a more powerful rank in the demon military hierarchy than the Princes of Hell. Both Lilith and Alastair are the chiefs of the demonic staff  and the Princes of Hell, the yellow-eyed demons are just the demonic army generals  . It can be assumed that holy water could only harm Alastair because he had long been trapped in a powerful old-Enochian devil trap and therefore his immunity did not really work properly. Alternatively, it can also be assumed that holy water could actually harm Azazel, but the yellow-eyed demon was only affected by his shirt, which is why holy water could not cause him any real pain, as in the case of Alastair. It can also be assumed that Dagon was given Lucifer's power to kill angels, because it makes no sense why a demon army general like Dagon can kill Angels, but not Lilith, although Lilith is as a white-eyed demon, Lucifer's Second-in-the-Command and the first demon was at all.
- In the course of the series, two different versions of how Abaddon came to possess Josie Sands, her main vessel during the series, are provided. In the first, reported in Season 8's episode Clip Show, Abaddon tells the Winchesters that she learned of Sands while torturing Father Max Thompson, one of the Men of Letters, who told her "all about" his female colleague. From then on, Abaddon "found her, and  rode her into the Men of Letters," suggesting that Abaddon went in pursuit of Sands with the intention of using her to study the Men of Letters and destroy them from within. The second version, shown in a series of long flashbacks in Season 9's Mother's Little Helper, portrays a very different story: in it, Abaddon initially possesses the Mother Superior of a convent investigated by Sands and Henry Winchester. Instead of Abaddon actively pursuing Sands, it is Sands who (unknowingly) happens upon her. Moreover, there is no hint during the interaction between Sands and Abaddon that the latter knew anything of the former and, in fact, upon learning that Sands is a female "Man of Letters", Abaddon reacts with surprise and amusement, which contradicts the earlier version that the priest had told her "all about" Sands before Abaddon had met her.
- Finally, Abaddon is described by Larry Ganem, in Season 8, as "a hired gun", strongly implying that she was working on someone else's orders when she struck against the Men of Letters; in the aforementioned episode of Season 9, on the contrary, Abaddon is shown to have taken the initiative to infiltrate the Men of Letters on her own.
- In Goodbye Stranger, Crowley says to Naomi "If you remember our time in Mesopotamia the way I do, you know I'm a lover, not a fighter." Which implies that they spent time together in ancient Mesopotamia. Based on information from a demon in Weekend at Bobby's, Rufus discovers Crowley to be "17th century Scottish tailor named Fergus MacLeod from Canisbay" and it was supposedly the ghost of his son who leads Bobby Singer and the Winchesters to locate his burial site and bones in Scotland. However that area of the Middle East was known as Mesopotamia by the west up until the 1920 Iraqi Revolt, at which point it became known as the Kingdom of Iraq. Robbie Thompson, the writer of the episode, explained that the line was either going to reference "Mesopotamia" or "Belize," and decided to go with Mesopotamia because he thought it "sounded funny," only later realizing the mistake.
- Lilith's plan for Season 3 and most of Season 4 seems to contradict her end plan to free Lucifer. For the entirety of Season 3 and most of Season 4, Lilith's plan was to kill Sam Winchester in order to rid herself of any opposition so she could claim the throne of Hell. She sent a number demons after Sam and personally attempts to kill him in the Season 3 finale, only to become scared when Sam proves immune to her powers. By the Season 4 episode The Monster at the End of This Book Lilith wants to make a deal with Sam and obtain his soul in exchange for escaping her fate as the final seal to Lucifer's Cage. Again, she makes an attempt to kill Sam, indicating she was pretending to offer a deal. By the Season 4's finale, she has submitted to her fate and lets Sam kill her as he was pre-destined to. This behavior is odd since Lilith had, pre-Season 3, ordered Ruby to act as a double agent and feed Sam demon blood so he would become powerful enough to kill Lilith anyway. Her motive for killing Sam appears inconsistent with her endgame. Killing Sam would prevent Sam from fulfilling his role as Lucifer's vessel. Even worse, once Lilith took control over Hell, all demons Sam encountered from then on sought out to kill him.
- In The Monster at the End of This Book it's stated that Lilith had faltered after learning that she wouldn't survive, explaining her sudden desire to stop her plan. At the end of Season 3, Sam is immune to not only her white light but her telekinesis as well which is something that is not seen again on the show. Its likely that Lilith was faking being scared to further manipulate Sam, especially since its unlikely that the Demon-Killing Knife could kill her.
- In Season 6 episode Appointment In Samarra, Death expressed his annoyance for the brothers' constant resurrections, as it disrupts the natural order, forcing him to clean up after them. However, in Season 11, Billie says that Death was amused by their resurrections.
- There are many inconsistencies along the series about how many angels had actually seen God. Anna Milton stated in Heaven and Hell that there were only four (presumably the Archangels). Later, in season 9, it was also implied, however, that Gadreel had seen him, as Metatron stated God stationed him with watching the Garden of Eden. Later it is revealed that Metatron also met him, and ultimately Don't Call Me Shurley implies that God was in a room full of angels when he chose Metatron to write his Word.
- During The Big Empty, The Shadow stated God had no power over the Empty but Castiel has been rebuilt several times by him. In Proverbs 17:3, Lilith was also resurrected by God, leaving this into question.
- In The Scorpion and The Frog, Sam was able to recognize immediately the fossilized tooth as being that of a Gorgon. However in "Ouroboros", neither he nor anyone else were able to recognize the creature that they were after before Rowena told them.
- In the Season 8 episode The Great Escapist, Sam recalls a visit to the Grand Canyon when he was four-years-old. However, Dean mentions in Season 2 episode Croatoan that they have never been to the Grand Canyon. Writer Ben Edlund admits this to be a mistake on his part.
- In Paint it Black, Olivette claims that witch-on-witch murder is an anathema to the Grand Coven. However previously in About a Boy, Katja was sent by the Grand Coven to kill Rowena.
- In Slumber Party, Charlie Bradbury goes to Heaven after being killed by the Wicked Witch of the West. However, it is revealed in Captives that Metatron's spell not only closed off Heaven to angels but also to souls as well. Charlie should have been stuck in the Veil like Kevin Tran was rather than going to Heaven.
- In Funeralia, Naomi reveals that the presence of angels is necessary to empower the Heaven, which contradicts Season 9. After the Fall, only Metatron was left in Heaven, and although he still had his wings, he was just a regular angel and yet Heaven didn't collapse. However, during Season 9 more angels were alive in general and its only after the deaths of so many angels that Heaven falls into trouble.
- There seems to be an inconsistent statement regarding how Lucifer was cast into Hell and subsequently the Cage. It is initially said that God had been the one to banish Lucifer into his prison, though Season 5 reveals that Michael did it on God's orders following the conclusion of the First Heaven Civil War. Dean tells Rowena in O Brother, Where Art Thou? that God dumped Lucifer into the Cage himself, which is untrue.
- In Season 12 episode Regarding Dean, Rowena MacLeod revealed to Dean she had met the Men of Letters years ago and ran away of their persecution. However in Season 10 episode Paint it Black, she was unaware of their existence until Olivette had told her.
Eve and the LeviathansEdit
- In season 7, it was said that God had created the Leviathan. In season 15, however, a Leviathan refers to Eve as "mother".
- If Eve is the mother of the Leviathans, it remains unexplained why the Leviathan Edgar referred to her as a "whore" to taunt the Alpha Vampire. In addition, in season 15 some Leviathans are portrayed as working for Eve and holding her in high regard, which contradicts Edgar's attitude toward her — that she was a "pathetic mutt" who did not belong with the Leviathan.[note 1]
- Furthermore, in the dialogue between Alpha Vampire and Edgar, the former tells the latter that "we come from you", which could only mean that Eve, as the mother of the vampires, was a Leviathan or a descendant of that race. However, as Eve is presented in the last season as the mother also of the Leviathans, they and the vampires can now be considered sister-races and, therefore, it makes no sense to say that one comes from the other.
- In Metamorphosis Dean and Sam first discover what a rugaru is from the hunter Travis. However, in Bad Boys a fourteen year old Dean, mentions his father is busy hunting a rugaru. Also in The Chitters, Sam comments to Dean that he was always afraid that Dean and John would be killed by a Rugaru.
- In the past all shapeshifter transformations (excluding the alpha) involved the shapeshifter's skin getting peeled/ripped off. However, in Blade Runners, a shifter is shown to seamlessly transform without shedding its skin. This ability was seen again in Bloodlines. VFX I/O Coordinator Adam Williams revealed he was puzzled at why this was. "No idea.. I kinda wondered the same myself. Originally I assumed there were "skinwalkers" and "shapeshifters" and the skinwalkers shed their skin - then I read the superwiki and realized the Alpha can transform without a skin shed but they are all the same monster. I guess sometimes legacy changes." 
- In The Chitters, Sam comments to Dean that he was always afraid that Dean and John would be killed by a vampire when they left him when they were kids. However, the Winchesters didn't know vampires existed until Dead Man's Blood in season 1.
- In Season 6, episode Mommy Dearest, Eve said that: "Each soul a beautiful little nuclear reactor. Put 'em together, you have the sun." Nonetheless, Castiel said in Season 11 that each soul has the power of one hundred stars. However, this could be a general comparison on Eve's part and Castiel could have been more literal.
- In Season 14 episode Byzantium, Anubis alleges that Death, the Reapers and even God have no say in a soul's ultimate destination. However this directly contradicts episodes like Meet the New Boss (Castiel would control the departed souls flow, choosing where each soul goes), Form and Void ( Billie states that when the Winchesters die, she will throw them into the Empty), Taxi Driver ( Ajay took Bobby Singer's soul to Hell instead of Heaven) and Raising Hell (God sent Kevin Tran's soul to Hell and not to Heaven).
- In Season 15, Belphegor states that a soul that has been in Hell cannot go in Heaven. However this statement is in contrast with the second trial to close the Gates of Hell: An innocent soul must be rescued from Hell and delivered to Heaven.
The Mark of CainEdit
- While Cain transferred the Mark to Dean, he still bore copy version of it, enabling use of the First Blade and being unkillable, however, Lucifer didn't likewise retain it after transferring it to Cain, and could still be killed by angelic and supernatural means.
- Up until Season 11 finale Alpha and Omega, killing Amara has never been stated to cause any side effects. Prior to this, attempts have been made by Dean and the angels, though both have failed due to the power difference. It is mentioned that during the First War against the Darkness, God and the archangels did not destroy Amara simply because they were not powerful enough, and had to resort to tricking her and then imprisoning her. It appears that everyone simply was unaware of the effects that killing Amara would have as God had to explain it to them.
- After God is weakened by Amara, the sun and plants begin to show signs of decay revealing that God and Amara must both co-exist or cease to exist in order to allow Creation to remain. Rob Benedict, who portrays God, revealed that this change in script was due to the network which airs Supernatural the CW, an early script draft revealed God was originally intended to die at the end of the season until CW intervened.
- In The Trap is revealed that there is a universe where Dean still has the Mark of Cain and killed Sam. However, since there's only one God and one Darkness in the whole multiverse, the Mark was supposed to ever existed only in the Main universe.
- The first five seasons take place in the current time, matching with the year the season was aired in. Season 5 concludes around May 2010. Between Seasons 5 and 6, a year has gone by during which Dean has been living with Lisa and Ben Braeden, and by the time Sam gets his soul back in Season 6 episode Like A Virgin, a year and a half has gone by since the Season 5 finale. This would put the date around November 2011. However, the Supernatural crew decided to resume their tradition of giving each season the same year it was aired in, leading season 6 to be marked with the year 2010. Assistant Director Kevin Parks explains this decision: "They decided to do 'soap opera time', because they didn't want to have to push the year forward for the rest of the show's run. So, just like in soap operas when people's kids are toddlers and then suddenly teenagers, so too can Sam and Dean spend a year apart while no time has actually passed in reality." The timing went back to normal after this with season 8 being both aired and set in 2012-2013, as proven by Henry Winchester travelling to 2013 in an episode that aired in January of that year.
- ↑ Some believe those remarks referred to the Alpha Vampire; the "whore" one, however, was doubtlessly aimed at Eve.
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