Party Animal/Ipso Fatso/Don't Yank My Chain - S1-E2
Other mistake: Don't Yank My Chain: When Lifty and Shifty get stuck on the railroad track in Handy's car, the railroad track abruptly ends at the left side of the screen, and it is purple instead of teal, like it should be. This reverts to the proper way in the shot where the train hits the car. (00:21:07)