Continuity mistake: When Tom Cruise first encounters Gene Hackman, Gene is nonchalantly leaning in a doorway with both hands in his pockets. In the next shot, Gene is holding a briefcase that wasn't there before. It's a good thing the briefcase arrived, since Gene makes mention of it immediately after.
Plot hole: In Cayman, Abby drugs Avery's drink at dinner. It takes effect as they return to the bungalow, and Avery passes out on the foot of the bed, fully clothed. In the next shot, Abby is in the kitchen, carrying the Mafia files. The bedroom is seen in the background, only now Avery is under the covers and without a shirt. After being knocked out by a "Mickey Finn," he wouldn't wake up, undress, and get into bed. Nor would Abby be able to do this - he is too heavy and bulky for her to move and undress alone, plus she would not have enough time to do that and also transport the many files, get them copied, and return them to the bungalow before Avery awoke. Avery would also be suspicious, knowing he was ill and had passed out atop the bed, but awoke undressed under the covers.
Factual error: Early in the movie, Mitch is shown walking through a lounge at Harvard Law School. The lounge has multi-colored chairs and couches. It does not exist at Harvard. This lounge is actually the Mark Twain's Lounge in the University Center on the campus of The University of Memphis.
Continuity mistake: As Tom Cruise is leaving Mud Island on a monorail car he passes another car with a Firm henchman in it. They see each other and the man gets out and runs across the bridge to catch Tom as his car stops. This is impossible since there are really only two cars which end up on both sides at the same time.
Continuity mistake: In the scene when Abigail and Mitch part. Abigail gets into the car and starts the engine but doesn't reach for the seatbelt. The camera switches to Mitch, he says "Take care of yourself" and then it cuts back to Abigail driving away but this time wearing a seatbelt. The time between the two cuts is too short for putting the seatbelt on, especially because Abigail didn't even make a move to reach for it before the first cut.
Character mistake: After learning of the firm's conspiracy, Mitch is worried about violating attorney/client privilege in order to expose it. Since Mitch knows that a crime is being committed (e.g. mailing the overcharged bills through the Post Office), attorney/client privilege doesn't apply.
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