Continuity: Level of coffee in the mugs in the interview room.
Continuity: Planes landing in New York City from South America would land at JFK, not La Guardia airport. The arriving passenger was picked up at the departure section of the Delta building.
Continuity: Hockney's position when Redfoot is leaving.
Continuity: The Sig.228 dropped in the garage turns into a Browning.
Revealing mistakes: Blood squib visible in the money bag as Hockney is shot.
Incorrectly regarded as goofs: During the line-up scene, as the suspects enter the line-up booth, a microphone can be seen above Hockney's postition. This is a standard feature of police line-up booths.
Continuity: The blood on the elevator window.
Incorrectly regarded as goofs: Keaton calls the language the Hungarians are speaking Russian, which although it sounds nothing like Hungarian, he wouldn't necessarily know. Verbal correctly identifies them as Hungarian, which is not surprising.
Continuity: When McManus lights the "finest taxi service" on fire, he drops the lighter, and the sky-view of the car shows fires starting on three separate places on top of the car: the hood, roof, and trunk.
Continuity: Keaton's cigarette when he leaves the police station.
Continuity: In the opening murder, the gunman is not wearing gloves. After the shooting, he is shown in close-up wearing gloves, dropping his cigarette. Then during his escape, while in shadow, he is visibly no longer wearing gloves. (Audio commentary reveals the close-up hand to be that of composer/editor John Ottman).
Continuity: During the lineup scene, as Fenster reads the card, Keaton's right hand is over his mouth (trying to cover his laughter, see Trivia) while his left hand underneath his jacket. As the angle changes, his left hand is now on his face and his right hand is under the jacket.
Errors in geography: When the crooked cops are driving Bartel, they pass a sign with a phone number on it. The number is for a California business, where the scene was shot, not a New York number, where the scene was supposed to be.
Continuity: Shot of a landing Jumbo Jet (four-engined Boeing 747) becomes a twin-engined 767 or 777 a minute later.
Continuity: When Keaton is sitting on the bench in the cell after the line up telling McManus to shut up, his shirt collar alternates between being under his jacket, and outside his jacket between shots.
Crew or equipment visible: During Verbal's interrogation, when Dave Kujan bends over to pick up the dropped cigarette lighter, several lighting stands and a flag are visible in the background, by the desk lamp.
Continuity: When the police investigator drops his coffee mug at the end of the film, we see several slow-mo shots of the mug breaking from different angles. However, instead of being several angles of the same action, the cup noticeably breaks in a completely different manner in each shot (the first almost completely shatters, the second shatters in a different pattern, whilst in the third only one side chips off, leaving the handle and quite a lot of the mug intact). Also when we focus on the wording bottom of the mug later on, it is surprisingly intact given the shattering scenes we previously saw.
Crew or equipment visible: In the scene when the men go to ambush Mr. Kobayashi at his law offices, just after he enters the front door of the lobby with his bodyguards, crew members and lighting stands are visible in the reflection of the polished marble as the camera dollies past the column.
Errors in geography: In the robbery of "New York's Finest Taxi Service", a large, tall, Los Angeles-style palm tree is visible behind McManus when he jumps on top of the police car.
Errors in geography: In the aftermath of the attack on New York's Finest Taxi Service, the firefighters are wearing Los Angeles fire helmets, not the black leather helmets used by New York.
Revealing mistakes: In the first hospital scene, the Hungarian's face is burned, but his right eyebrow isn't even scorched.
Continuity: In the scene where Kobyashi is walking through the office building flanked by his two bodyguards, just before the camera pulls back to reveal Hockney, we see an African-American woman in a white blouse and tan slacks walking along side of Kobyashi. In the next cut to Kobyashi walking through the elevator corridor, if you look to the bank of elevators to the left, you'll see the same woman coming out of an elevator as if she had just come down from one of the upper floors.
Audio/visual unsynchronized: During the harbour scene near the end, the report of McManus's Steyr AUG is very muted and yet he has no silencer attached.
Continuity: During Verbal's interrogation, his coffee mug is empty when he takes the first sip. In the next scene, it is fine.
Factual errors: In the hospital scenes in the burn unit, the medical staff are gloved and gowned but their surgical masks are pulled down under their chins. Their masks should be covering their noses/mouths because burn victims are extremely vulnerable to infection.
Factual errors: During the robbery of "New York's Finest Taxi Service", the driver of the police car is wearing chevrons on his shirt sleeve indicating he is a Sergeant, but is actually wearing a badge that indicates he is the rank of Police Officer. (Clearly visible when the guy in the van rips it off his shirt.)
Continuity: The boat explodes at night at the beginning of the film. But during the establishing shot of the detectives investigating the wreck the smoke appears to have only just begun pouring out.
Errors in geography: In the beginning of the movie, we see "San Pedro" police department. San Pedro is part of the city of Los Angeles, and as such, it would be "Los Angeles" Police Department, San Pedro division (or precinct).