Continuity mistake: Near the end of the movie, the woman kidnapper's tattoo has apparently slipped down about four inches after she's fallen down some steps, then it has sprung back where it was to start with.
Continuity mistake: When the first kidnapper gets shot in the rock quarry, his mouth is full of blood. Yet in the next shot his mouth is clean. (00:50:17)
Continuity mistake: Towards the end of the film, Gary Sinise is watching Rene Russo and Mel Gibson playing ball with their son. He is standing on a balcony. If you look in the background there are two people, a woman in a brown coat and a man in a grey coat. There are four different shots of Gary Sinise watching. The first shot has the people way back, the next shot they are walking off the scene, but the third shot has them back behind Gary Sinise again.
Continuity mistake: Toward the end of the movie there are TV scenes of people on the street being interviewed. In the background all the cars are covered with heavy snow. When the scene switches back (not being shown on TV) there is no snow anywhere.
Continuity mistake: In the middle of the movie when Mel Gibson is in the interview room in the jail with the guy who he paid off to stop the machinist strike, the guy jumps at Mel and punches him. Mel gets up and he has a bloody mouth. A few seconds later after the guy is led out of the room Mel no longer has blood on his mouth.
Continuity mistake: Towards the end of the movie when Tom and Jim are on their way to the bank Tom has gloves on when driving. Through most of the shot people are dressed for cold weather. However as they go by the side streets the trees are green with leaves, indicating late spring in NYC. When they arrive at the bank the trees have no leaves, indicating pre spring or winter conditions.
Continuity mistake: Earlier in the movie, we can see in the elevator that 16 is the highest number floor before the Penthouse (PH). Since they live in a two-story Penthouse, that would mean they are occupying the 17th and 18th (top two) floors of the building. But later in the movie when Mel Gibson hears the shot on the phone and thinks they have just killed his son, he runs out onto his balcony and looks down at the street. He is only about 4 or 5 stories up at this point.