User blog comment:Tommy,Klaus&Kol2012+/mistakes in supernatural/@comment-79.115.68.194-20150917132803/@comment-79.115.75.190-20150921130851

And another mistake about the writing is killing death in the finale. In an early episode he said that he last forever. And even if he can be killed by his own weapon, why would he give to Dean the only  weapon that could kill him to kill Sam ? Sam is human, he can be killed by a gun. I really hoped after i seen that scene that Death gave him the weapon to test him, and he is not really dead. But for my disappointment i find out on this wikia that Death is really dead.