10 Small Details You Only Notice Rewatching Supernatural
4. Black-Eyed Dean
In Season 3, Episode 10 - Dream a Little Dream of Me, Dean faces off against a dream version of himself. After being shot, Dream Dean's eyes turn pure black and he says to the real Dean, "You’re going to die Dean, and this is what you’re going to become."
At the time of this episode, the Dream Dean's taunts were related to real Dean's fears of becoming a demon in Hell due to a deal he'd made with a crossroads demon... but by the time Season 9 rolled around this dialogue took on a deeper meaning.
At the end of Season 9 Dean dies. He is resurrected as a black-eyed demon. Though at the time of writing Season 3 no one could have known that there would be nine seasons, it is a wonderful example of Supernatural's knack for backshadowing. In re-watching season 3, the line now appears to be intentionally prophetic.