Episode is All Hell Breaks Loose II
It is the second time the song Carry on My Wayward Son by Kansas is used in the show. It was first used in "Salvation" (season 1 episode 21) over the opening sequence showing what previously happened during the first season. The song is used again in the opening sequence of this episode showing what previously happened during the first two seasons.
Dean said "We've got work to do" as he closed the trunk of the Impala. Sam said the same thing as he shut the Impala's trunk at the end of the pilot episode. Not to mention that, in the pilot episode, Sam was standing on the left and Dean was standing on the right (and Sam was the one who dropped the gun into the trunk and closed it); in the season finale of this season, the brothers were standing on opposite sides and Dean was the one who dropped the gun into the trunk and closed it.
Quote of the day:
Jake: You were dead. I killed you.
Sam: Yeah? Well, next time finish the job