He's Too Sexy for His Fat - S2-E17
Continuity mistake: Peter brings Chris to the front door of the beautiful people club, and Warren steps out to greet them. There is a shadow cast on the sidewalk by the awning, and in the first shot, Peter and Chris are both standing in the shadow. In the next shot, suddenly Chris is no longer in shadow, Peter is at the very edge of the shadow, and Warren is much further away from the front door. (00:18:55)