Continuity mistake: At the start of the film we are introduced to Michael Douglas' family life. His wife is in the bathroom getting ready for their night out, Michael is sat on the couch reading and his daughter, Ellen, is sat on the chair watching cartoons. In one shot Ellen is sat on her own, but in the next shot their dog has magically appeared on her lap.
Plot hole: In the kitchen, when Michael Douglas is preparing the hot water for the tea just before the final bathroom fight, there is a shot of him looking up at the ceiling and noticing the leaking water (obviously from the overflowing bathtub). But, he turns back toward the stove and continues to prepare the tea, instead of having an immediate reaction that something is wrong. It is not until the teapot whistles, and his wife screams, that he realizes something is wrong. He should have run up stairs as soon as he noticed the water leaking from the ceiling.
Visible crew/equipment: When Dan reluctantly tells his secretary that he will accept Alex's phone call, if you look in the top left hand corner of the screen, you can see a boom microphone make a quick appearance.
Continuity mistake: Dan plays the tape that Alex made in his car. He stops the tape when he gets home, and after he gives his daughter a pet rabbit, he goes to his den and puts the tape in the tape recorder and presses play - that's all; he doesn't rewind it - but what he hears is the same bit he heard in the car, which is wrong; the tape should have started play where it left off in the car.
Continuity mistake: Playland, Rye NY in the spring, summer and autumn. Alex and the girl walking to the Dragon Coaster. It's spring with the leaves in bloom. Then in stock footage of a different roller coaster being pulled to the top, it's fall with the leaves a golden yellow. Then in other stock footage, the trees are a lush summery green. (01:36:35)
Continuity mistake: When Michael Douglas comes home the first night after being a bad boy with Glenn Close, he is shown in the kitchen talking on the phone to his wife at a little after 8:30 AM. Not only does he talk to her, but he also has a whispery chat with his lover, walks all about the kitchen, sits at the table, and the time on the clock doesn't change once. (00:22:20 - 00:23:05)