Other mistake: At the Children's Therapy Center, a girl says she has a tick that makes her bend her neck and snap her fingers. In this shot, Thomas and the girl sitting next to him are reflected in the mirror behind her, but their reflections are not backwards like they should be. This is shown a few more times in following shots. (00:07:57)
Continuity mistake: When the perv runs into the studio (thinking it's a house), he runs into the Dateline show and runs half way down the stairs. However, when he shoots himself in the head, he falls down two stairs. But in the wide shot, he's at the bottom of the stairs. If it was in the middle of the stairs he should be one step higher. (00:19:30)
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