Continuity mistake: There is a scene where the FBI show up to the North American Marlon Brando Look Alikes meeting by mistake. However, during a close up of the leader's (the geneticist's) face, you can see the bottom of the banner actually says "Man Boy Love", as in the other NAMBLA.
Continuity mistake: When Kyle tells Mr. Hankey, Autumn, Cornwallis, Amber and Simon about the $300 he, Cartman, Stan and Kenny got for the animated Christmas card, the olive stick in Autumn's martini glass is facing to the right. But when Autumn says to Mr. Hankey "That's not the only thing we've got to get working again if you know what I mean", the olive stick in the martini glass is now facing to the left. The olive stick then returns to facing to the right for the remainder of the scene.