Audio problem: Near the end of the episode, where the boys are standing at the bus stop and Kenny (who is in a seizure trance) starts getting attacked by rats, Cartman yells, "Hey, get away. He's not dead yet", but it doesn't sound like Cartman (the tone seems more high-pitched.).
Continuity mistake: At the toy store, Stan shows Cartman the three Chinpokomon he is buying: Lambtron, Roostor, and Shoe. When Stan's mother is at the cash register paying for his toys, though, she has a different Chinpokomon and Pingin. At the bus stop the next day, he has yet another different Chinpokomon.