Ginger Kids - S9-E11
Other mistake: When Cartman is made into a ginger kid, his hair is suddenly longer than before and he has a fringe.
Ginger Kids - S9-E11
Continuity mistake: When Stan, Kyle and Kenny are going to Cartman's house to turn him back to normal and get surrounded by the Ginger Kids, Kyle is wearing his pyjamas with a coat over the top. But by the time he and Stan reach the barn to shelter from the attacking Ginger Kids, he's suddenly wearing his normal green trousers.
Answer: He appears in at least 5 other episodes, but usually just as a background character. He can be seen at Cartman's party in "Immaginationland". He was also one of the kids trying out to replace Butters in the "Professor Chaos" episode.
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