Continuity mistake: When we see George from outside his house, there is nothing but clear glass, but when we see him from inside, there is a black rail accross at about waist level. (00:12:30)
Continuity mistake: When Spielberg and Lucas are sitting behind the boys, the camera shows them to be sitting up higher that they are in other shots, when it is focused on them, you should be able to see the tops of the kids heads sitting in front of them. (00:08:00)
Continuity mistake: When Tweak is making the paper hats, watch Mr Tweak as he tells him to calm down. When Mr Tweak turns and walks away, his hair vanishes and he becomes bald.
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