Starring: Frank Oz, Jim Henson, Dave Goelz, Richard Hunt
Zero Mostel - S2-E2
Visible crew/equipment: When Zero Mostel is dispelling the monsters, you can see a puppeteer's head to his right for a brief moment before it disappears. (00:20:00)
Zero Mostel - S2-E2
Visible crew/equipment: As Animal hits the cymbals, the top of a puppeteer's head pops up for a split second next to the drum. (00:22:45)
Mark Hamill - S4-E16
Revealing mistake: When Luke Skywalker is introducing his 'cousin' Mark Hamill at the end, you can tell it's a split screen by the fact that Luke looks right past him, even once he's on stage. (00:25:10)
Waldorf: Well, you gotta give them credit.
Statler: Why's that?
Waldorf: Well, they're gonna keep on doing it till they get it right.