The episode from Supernatural Season 1- Episode Title: Provenance

Sam and Dean are in the house where a supernatural murder has occured. They are investigating. There is another character named "Sarah" with them. The character of Dean (played by Jensen Ackles)says "Jared, check this out" Using the actors REAL name (Jared Padalecki plays "SAM") instead of saying "Sam, check this out." In the scene, "Sam" turns and looks and continues on as if he had said "Sam" and not "Jared."

Time Frame: 26 minutes and 45 seconds into the episode.