So This is How Sinatra Felt - S6-E12
Plot hole: Bud and Kelly hide behind the cash register all day. They talk normally the whole time yet Al doesn't hear a word they say and has no idea they are even there.
Married... with Children (1987)
1 mistake in So This is How Sinatra Felt
Starring: Christina Applegate, Katey Sagal, Ed O'Neill, Amanda Bearse
Genres: Comedy
Al Bundy: When I said I needed money for the meter you said you didn't have a dime.
Peg Bundy: No, we said we didn't give a damn.
Trivia: Ed O'Neill is only actor to appear in all 260 episodes of the show.
Question: What did Al remove from The Lundys' car to cause it to crash?
Answer: It was one of the hoses connected to the engine, nothing specific, but to indicate that Al tampered with the vehicle.