Osama Bin Laden Has Farty Pants - S5-E9
Continuity mistake: When Osama is video taping his message, Kenny is sitting on the left side chair but when you see the video on the news, Kenny is setting on the far right side next to the goat. The other characters except for the goat change places as well.
Butters' Very Own Episode - S5-E14
Continuity mistake: When Butters' mom paints his face with the roller, the paint is the color of the wall rather than the color she is painting. (00:05:00)
Butters' Very Own Episode - S5-E14
Continuity mistake: When we view Butters from the front of the car, the clip of his seatbelt is above the seat, but when the shot changes to a closeup of Butters, the clip is below the top of the seat. (00:07:55)
Butters' Very Own Episode - S5-E14
Continuity mistake: Butters' mom is holding a knife, pointed at her shoulder, but in the very next shot it is down near the cucumber, and then goes back.
Butters' Very Own Episode - S5-E14
Other mistake: When Butters is travelling down the river in his mom's car, the passenger door opens just before the car hits the rock.
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