Deliberate mistake: The car Rudy, the mechanic, is working on is a 1971-72 Plymouth (the one where the chassis falls down around him). Plymouth's of that era were unibodies, which means that the body and the chassis were all one piece and not separate, so there's no way a chassis could have fallen down like that from that particular car, since it didn't have a separate chassis.
Bachelor Party (1984)
1 deliberate mistake - chronological order
Directed by: Neal Israel
Starring: Tom Hanks, Tawny Kitaen, Adrian Zmed, George Grizzard
Continuity mistake: In one scene, Tom Hanks leaves a room while the last part of "Something Isn't Right" by Oingo Boingo is playing. When he reenters the room, the middle of the song is playing.
Mrs. Thompson: A strange wang right in my palm.
Chosen answer: It's showing he's sexually adventurous, as he's using a cooking appliance as a sex toy.