Spn should have given us an episode where Dean, Sam, and Cas are all trying to tell a story about whatever happened before the episode. And Jack in an effort to practice the limitations of his powers either inspired by Gabriel or under his guidance, he let's his dads visually tell the story. So we the audience watch dramatic reenactments with each one taking a turn narrating. So we see Sam, Dean, and Cas recast according to how each one perceives the others.
Notably Dean makes Sam super short and Cas look like a stereotypical 80s movie NERD. Cas makes Sam incredibly random and nondescript because he doesn't pay him much mind and Dean is like a romance cover Fabio type. Everyone looks the same in Sam's version except his own hair is longer & he makes Dean and Cas act like an aggressively PDA couple.
Oh yeah, in Cas' version of the story every time the camera cuts to Sam it's an entirely different actor. We only know it's Sam because they're all wearing the same bad wig and a name tag.
