Other mistake: During the fight between the Internet stars, no one kills Afro Ninja, but he is dead at the end.
Other mistake: When the camp guards take the internet away, the computer cable being dragged away is not plugged into anything, even though the computer was on. (00:17:15)
Other mistake: In this episode we see Britney in the hospital and there is a chart on the end of her bed. However the chart is identical to the one that was on the end of Cartman's bed in the previous episode. (00:07:50)
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.
Bishop73