Revealing mistake: The burglar uses a crow bar to open the sliding glass door. You can plainly see him "pretending" he had to use it when it just opens easily. He didn't really pry it open.
Married... with Children (1987)
1 revealing mistake in Un-Alful Entry - chronological order
Starring: Christina Applegate, Katey Sagal, Ed O'Neill, Amanda Bearse
Genres: Comedy
Movie Show - S7-E21
Revealing mistake: When everyone is standing at the snack bar eating all the food you can plainly see all the candy boxes are empty and already open even though they were sealed when the cashier put them on the counter.
Peg: Hi honey. Did you miss me?
Al: With every bullet so far.
Trivia: When Al and Peg are in the video store looking for a movie to rent, the video store is giving away free copies of the movie "Dutch" which is a comedy that starred Ed O'Neill.
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.