Continuity mistake: The whole time sequence in the last part of the movie is messed up. After trying to nab the bad guys at the hotel, Tom Selleck goes home and puts his son to bed, then is called back in to work, and then the rest of the film is supposed to be the same evening, but it was already late night.
Factual error: Thompson wears moderately high heels in uniform and undercover. Unless she was working strictly in the office, she'd be required to wear tennis shoes or at least flats so she can run.
Revealing mistake: Almost every time a floating robot explosive that is chasing the police cars is seen, you can see a wire that is pulling them.