Revealing mistake: When Leo Sayer is in the tree singing you can the wire on his back supporting him.
The Muppet Show (1976)
1 mistake in season 3 - chronological order
Starring: Frank Oz, Jim Henson, Dave Goelz, Richard Hunt
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.