Other mistake: When Russell Hammond goes to William's house he spots a professional photo of William and his sister Anita. The photo shows William as a 15 year old with his sister. But Anita has been away working as a stewardess, and has not seen William since he was 11 - who was played by a younger and different actor in those scenes.
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Suggested correction: It was never said that Anita had not been home since she left at the beginning of the movie. Even though she and her mother had a strained relationship, she would likely have been back for short visits.
