Continuity mistake: During the Butters motivational speech, from the front Craig's tinfoil hat is off and his woolly one is shown, but from behind, the tinfoil one is on and his woolly hat is under it. (00:06:00 - 00:07:00)
Insecurity - S16-E10
Continuity mistake: Cartman walks into his house and can't remember the code to turn off the alarm, so he gets a call from the security company. When the man on the phone introduces himself, the clock on the wall to the right of shot reads 2:02, then the time changes to 12:37, then back to 2:02 again.
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