- Crew or equipment visible: There were several scenes where Johansson's lapel mike radio frequency transmitter strapped on her waist behind her is visible.
- Errors made by characters (possibly deliberate errors by the filmmakers): When Sid Waterman first tries to enter into the music room, he says that the combination is 16 blue ponies, 20 airplanes, and 12 spinning midgets; however, the correct code is 16, 21, 12, which he enters correctly on the keypad.
- Miscellaneous: In the end credit soundtrack section, the composer Edvard Grieg is misspelled as "Edvard Greig".
- Factual errors: The instrument in the Music Room under which the Tarot cards are hidden is constantly referred to as a "French horn" when in fact it is actually a Conn 16E Mellophonium. Additionally, in the first scene in which the Mellophonium is shown it appears without a mouthpiece. In all subsequent scenes a mouthpiece is in place.
- Continuity: When Sondra sits in the boat with Peter before he pushes her into the lake she wears beige / light brown clothes. When she returns to the house and happens upon Peter and the policemen, being still wet, her clothes are dark brown, almost black. That's too dark to be wet beige. It can't be muddy either, because the rest of her (hands, hair, face) are clean.
- Continuity: When Peter is telling Sondra about the murder when they are out on the lake, the sky on Sondra's side alternate from dark to light between the shots.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Plot holes: SPOILER: When Peter saves Sandra from "drowning" at the club, she specifically tells him that she is actually a very strong swimmer, but that her leg had cramped and caused her to start going under. Did he just forget about the whole exchange when he decided to kill her by throwing her in the lake?
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