Continuity mistake: When Butters is in the hospital, you see blood start coming down his cheek, but when the shot changes from a top view to a view from his feet, there is no blood running down his cheek, which should've started showing in the shot already.
Continuity mistake: In the town hall meeting scene, a man says that he is "shocked and appalled" by what has happened. In the wide shot, he is sitting next to Liane Cartman. In the closeup, Liane is replaced by a woman dressed in purple. In the next wide shot, Liane is back.