Revealing mistake: When Cartman walks in on Sally Struthers eating the cake, the cake has holes in it, and part of her hair goes in front, and part of it is visible through the cake. All of the other slices have holes in the same place as well.
South Park (1997)
1 mistake in Starvin' Marvin
Starring: Trey Parker, Isaac Hayes, Matt Stone, Mona Marshall
Scott: All of these things link Terrance to the murder: hair fibers, blood samples, nail clippings, a piece of his shirt, a watch with his initials on it, a day planner with the murder scheduled, a haiku called "Time to Kill Dr. Jeffrey O'Dwyer": Dr. O'Dwyer, time to have your head smashed in with my new hammer. Terrance, you may be a famous surgeon, but you're not God. J'accuse Terrance.
Trivia: Dr. Mephisto is based on Marlon Brando in The Island of Dr. Moreau (1996).
Question: Forgot the episode and the season, but does Mark, the kid that gets home schooled and ends up beating Kyle, ever show up in later episodes?
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