After the second bank robbery, while the women are modifying their vehicle, they are clearly wearing black, flat, men's-style shoes. However, when they pull of their suits only a few moments later, the women are suddenly wearing high heeled sandals.
When the captain shows Washburn the newspaper, it features the mugshot with the fake mustache on, but after crashing, he took it off and threw it on the floor.
Right before Washburn exits the bus and puts on the fake mustache, there is a tall short-haired blonde woman in an army green jacket walking with a large bag. In the next shot from above, she does not appear to have this bag as she goes around the corner.
When Belle gets her taxi back after being impounded by the police, the previously broken back left window has been fixed. As the police were keeping the car as evidence, they wouldn't have fixed it, or else they'd be tampering with evidence.
When Washburn and Belle are at the Sanitation Department they say that the garbage man they are looking for is "Anthony Scalia" and show his name on the computer terminal. When they show the garbage man in the next scene, the name on his shirt is "John".
When Washburn crashes the first car, he pounds on the steering wheel. This action triggers inflation of the airbag. The sensor for the airbag is in the front bumper, which was undamaged as the car ran backwards into the store. Thus, pounding on the steering wheel would not fire off the airbag.
When Belle runs over and knocks down the fire hydrant, water squirts straight up out of the top of the air intake scoop. This would be physically impossible as the water would have to go through the engine first. Additionally, there is no opening on the top of the induction scoop, and any water in the intake would shoot out of the front, not out of the top.
During the exterior driving scenes, the induction plates on the air intake do not move when the engine is accelerated and the car is speeding up. The plates should open up to allow in more air every time the gas pedal is pushed as it is mechanically linked to the pedal.
Belle is presented with a ProCharger centrifugal supercharger that mounts on the front of the engine, not on top with an intake protruding through the hood.
Agent Mullins says he is from the FBI's "Armed Robbery Unit". The FBI does not have a unit focusing solely on that crime. If Agent Mullins was assigned to the Violent Crimes (VCMO) section of the FBI's field office in Manhattan, he would investigate the bank robbery in that capacity.
Obvious thinner stunt double in opening bike sequence.
In several scenes, people turn their steering wheels without the cars responding to it.
On the side of Belle's taxi it reads "Taxi N.Y.C". In real life taxis in New York have "N.Y.C Taxi" written on the sides.
At the end when the silver cars jump the freeway one of the cars skids to a stop, if you look on the ground you can see skid marks from a previous take.
During the chase/exchange on the freeway, Marta is in the car with the Blonde on the passenger side of the Taxi and then the next scene, just before the cars jump the gap, she's in the other car with the brunette, and the blonde is on the other side of the taxi talking to Belle.
When Jesse melts Washburn's badge, when Washburn is banging on the door, his lips don't match what he is saying.
When Belle first drives her taxi out of her garage, a black cameraman wearing an orange jacket with black stripes can be seen reflected in the back window.
When Washburn reverses car into store at 16.05 the stuntman playing his partner is clearly wearing shorts rather than the trousers the character is wearing when he gets in the car.
The camera crane's shadow can be momentarily seen on the freeway, before the robbers jump over the incomplete bridge.
In the opening sequence with the bicycle, palm trees are visible. The movie is set in New York City.
While Belle's driving the businessman from Times Square to JFK airport, the trees dotting the streets, the cleanliness, and the blue street signs hanging from the traffic lights are all dead giveaways of Los Angeles shots.
When Andy hears the radio dispatch about the robbery, he's walking down a New York City street. When he pulls out his badge to stop a car seconds later, he's on a Los Angeles street. The shots of him are in New York, the shots from his POV of cars crashing are in Los Angeles.
Opening bike sequence is supposed to take place in New York City, but the ramp stunt after the department store and the bridge stunt finale, were clearly filmed in Los Angeles.
Washburn opens the valve on a tank of Nitrous Oxide, saying that they can't fire at them because the "flammable" gas will explode. Nitrous Oxide is not flammable but it is an oxidizer. If you lit a match in a room full of N2O the flame would glow brighter than usual but there would be no explosion.
The Lieutenant tells Washburn that he is "Not suspended, but fired". While a superior officer has the ability to remove an officer from service and suspend, they cannot summarily fire the officer. Firing an officer involves a formal hearing before termination can take place.
The Lieutenant takes Washburn's driver's license first, and later takes Belle's license. A police officer does not have the power to "take a driver's license", as only a judge can do this in accordance with the law.
When Washburn tells the impound officer he says that Belle is a Lieutenant in SWAT. NYPD has no SWAT team, but an Emergency Services Unit that also functions as a SWAT unit.
The helicopter pilot says the thieves are cutting through "Grand Central Station", instead of its correct name Grand Central Terminal.