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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.

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Trivia: After Alex takes Dan's daughter for an hour or two, and Beth has a car accident, as she frantically searches for her daughter, Dan rushes over to Alex's place to kill her, but he has enough sense not to, and, in a Hitchcock way, the camera zooms in on a very large knife that Dan puts down on a ledge, with know-it-alls yelling, "It has your fingerprints on it," he walks away. The original ending had Alex killing herself with the knife that has Dan's fingerprints on it and Dan going to jail for Alex's murder. When they showed this version to a test group, all of them yelled and screamed so much that they had to change the ending.

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Continuity mistake: When Dan throws Alex into the bath, she goes in face down, but suddenly she is face up - which would be a difficult manoeuvre in a small bath.

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Continuity mistake: When it looks like Alex is dead in Dan's bath, she has a long strand of blood coming out of her mouth, but a second later it's gone, and her eyes, which were white, are no longer white - they are open and look like normal eyes.

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Character mistake: When Dan and Beth are talking on the phone, Beth says Ellen, their daughter, is five years old, but later, when Dan and Alex are together, Dan says Ellen is six years old.

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Continuity mistake: When Alex, naked in bed, jumps up to stop Dan leaving, she attacks his shirt, and you can hear it ripping, but, later, it's completely fine - no ripped bits anywhere.

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Continuity mistake: When Alex goes to see Dan in his office, Dan in the first scene is sitting with uncrossed legs, then his legs are crossed, then uncrossed again.

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