- Boom mic visible: In the second scene where Kimball (the detective) is interviewing Bateman, the reflection of the microphone can be seen on the CDs to the left of Bateman.
- Crew or equipment visible: In multiple scenes at Bateman's apartment, the crew and camera operators are visible in the reflection of his bedroom TV.
- Continuity: Bateman is at the Christmas party wearing reindeer antlers. As the camera shot changes from front to rear, the antlers move from behind Bateman's ear to in front of it.
- Anachronisms: The porno movie that goes on during Patrick's telephone conversation with his fianc» is taken from Red Vibe Diaries: Object of Desire (1997) (V), produced in 1997.
- Anachronisms: When Patrick is listening to his new Robert Palmer tape, you see the cab drive by an FDNY ambulance. FDNY didn't take over ambulance services until the early 1990s.
- Audio/visual unsynchronized: When Patrick Bateman is "watching" The Texas Chain Saw Massacre (1974) (while exercising) the screams of Sally Hardesty are inconsistent with the original soundtrack.
- Anachronisms: The TV that is shown at the end of the movie with President Reagan speaking is a late '90s model of Sony Trinitron.
- Crew or equipment visible: Camera and mount are visible in the title sequence, reflected in a silver knife that is placed on the table.
- Anachronisms: When Bateman is using the pay phone on Park Avenue, the skyscraper in the background says "Met Life", when it should say "Pan Am". Although the building was sold by Pan Am to Met Life in the 1980s, the name displayed on the building wasn't changed until the early 1990s.
- Errors in geography: Bateman's office is supposed to be located downtown, yet the view out his window is clearly of midtown.
- Anachronisms: The telephone next to Patrick Bateman's bed is a Bang & Olufsen model not available in the 1980s
- Errors made by characters (possibly deliberate errors by the filmmakers): Patrick mentions a quote and attributes it to Ed Gein, who didn't really say it. Edmund Kemper said it first.
- Continuity: When Patrick Bateman is being questioned for the first time by Detective Kimball, a pill bottle appears in front of him on the desk blotter between shots.
- Continuity: During Patrick Bateman's first meeting with Detective Donald Kimball, Jean brings Detective Kimball mineral water that he does not want. She sets the bottle of water and glass on the corner of the desk. During the conversation between Bateman and Kimball, the glass and bottle move from the corner of Bateman's desk to a slightly deeper part of the corner, and an ashtray moves into their original place.
- Revealing mistakes: When Bateman hits Paul Allen with the axe for the first time, the blood sprays on him before he actually hits him. Also the blood comes from a different angle than where Allen's head is supposed to be.
- Errors made by characters (possibly deliberate errors by the filmmakers): Patrick Bateman stated that the Huey Lewis & The News album "Fore!" was released in 1987 when it actually was released in early 1986 as a follow up to their single "The Power of Love".
- Continuity: When Patrick Bateman is packing a suitcase in Paul Allen's apartment, the light is switched off in the bathroom behind him. But as he stands up and heads for the door the light is now switched on.
- Audio/visual unsynchronized: Blood spray on Bateman's face begins slightly before sound of impact of ax blade.
- Continuity: When Patrick and Evelyn arrive at Espace, Vandon and Stash are sitting next to Bryce and Carruthers when being introduced to Patrick. Later in the conversation, they are sitting on the opposite side of the table.
- Crew or equipment visible: When Bateman is at the ATM getting cash out, the lady walks by him. As he walks to catch up to her, the camera and crew are reflected in the glass of the storefront windows.
- Errors made by characters (possibly deliberate errors by the filmmakers): When Patrick tries to order drinks at the Tunnel bar, he asks for "two Stoli on the rocks." Instead, he receives two Stoli's up (no ice).
- Revealing mistakes: All of the windows show views of the cityscape with the horizontal line far above normal. This signals that the views are backdrops which are set too high. Often one looks up at a character and at the same time looks down on the streets, which is impossible.
- Anachronisms: The film is set in 1987. In his apartment, Patrick offers 'Christie' and 'Sabrina' a Varda truffle. Varda Chocolatiers was not established until 1989.
- Errors made by characters (possibly deliberate errors by the filmmakers): While rhapsodising about Genesis' "Invisible Touch" LP, Bateman states that "Phil Collins addresses the problems of abusive political authority" on the song "Land Of Confusion." That song's lyrics were written by the band's guitarist/bassist, Mike Rutherford.
- Continuity: After killing Paul in his apartment, dragging his body through the lobby you can see the blood trail following the bag. But once he's outside flagging down the cab, the view back into the lobby shows no blood.
- Errors made by characters (possibly deliberate errors by the filmmakers): The album Bateman holds up while entertaining the escorts is Phil Collins' solo album "No Jacket Required", although "In Too Deep" is from the Genesis album "Invisible Touch". Although it seems like a minor error, someone as obsessed with pop music as Bateman is would be unlikely to make such a mistake.
- Revealing mistakes: Patrick pronounces "Robert Palmer" as "Robert Parmer", revealing a flaw in Christian Bale's staged American accent.
- Continuity: In the scene where Patrick is sitting on his couch making reservations for Dorsia, the camera angle from the side shows his hair styled entirely back from his face. When the camera angle switches to the front there is a noticeable lock of hair hanging in front of his face. The camera switches back to the side view and his hair is styled entirely back from his face again.
- Anachronisms: Patrick records a voice mail on behalf of Paul Allen wherein he concludes the messages "Hasta La Vista, Baby". The phrase "Hasta La Vista, Baby" was not made popular until the release of Terminator 2 (1991) wherein the film is set in the late 1980s.
- Revealing mistakes: 'Acquisitions' is spelled incorrectly (as "aquisitions") on all the business cards.
>>> 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.
- Revealing mistakes: SPOILER: Bateman could not have killed Jean with the nail gun because that model of nail gun must be plugged into an air compressor for the nails to be fired. If he had pulled the trigger the way he was holding it [without it plugged into anything], nothing would have happened.
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