Corrected entry: During the Rosanna Arquette/Steve Guttenberg sketch, when she opens the door at the beginning of the sketch, you can see the violin facing forwards, but at the end of the sketch, you can see it facing sideways. But nobody went anywhere near it as they were all on the other side of the room.
Corrected entry: In the "Mondo Condo" scene where Arsenio Hall is struggling to get his necktie out of the garbage compactor, he knocks over a beer can on the counter. But in the next scene the beer can is back on the counter.
Correction: Copied verbatim from IMDb.
Correction: The instrument is a cello. It does not change position, that is a trick of perspective caused by a change in camera angle.