Plot hole: The damage caused to the house and garden when the jet crashed isn't anywhere near sufficient. The house is wooden, and the force of the explosion would have blown the house to pieces.

Other: When Brendan Fraser's character drives home in the cube van, he neither places the transmission in park (if the van has an automatic transmission) nor shuts off his motor (for a manual transmission); he just comes to a stop and steps out.

Deliberate "mistake": In the scene where Alicia Silverstone and Dave Foley are in the porno store, they cut to a guy standing behind a counter. All of the explicit shots of the videotape covers on the countertop are blurred out.