Dean Winchester: Damn cops.
Sam Winchester: They were just doing their job.
Dean Winchester: No, they were doing our job, only they don't know it so they suck at it.
When Dean is speaking to Sam, who is now Lucifer, he starts crying. Tears are physically on his face but in the next shot the tears are gone. See more...
Dean's guiding angel Castiel is also the angel of Thursday. Fitting, since Supernatural airs on Thursdays in the U.S. See more...
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Supernatural (2005) - 2 easter eggs
Easter eggs are hidden bits on DVDs which if you know where to look can provide all sorts of fun extras.