Patzer

The size of the damage on the taxi's smashed windshield is inconsistently larger or smaller throughout the film.

After Max and Vincent leave the Fever Nightclub, Max crashes his taxi into two parked cars. In the first shot of the front of the car after the crash the taxi appears to have no damage at all, the following shot the left front light is broken and there's damage to the side of the taxi. In the next shot, the damage is gone again.

After the shootout in the subway, Max has his glasses on. Then when Max is shown sitting across from Vincent they're off and he puts them on. Then when they show him get off the subway with Annie, he doesn't have glasses on again.

Vincent cut the power lines yet Max and Annie are still able to take the elevator with no issue.

When Vincent checks Annie's desk, the telephone receiver changes from being aside of the phone to hanged up in the reverse angle shot.

When the two LAPD officers pull Max over, the black officer is sporting a goatee. Per LAPD regulations, no uniformed officers may have a goatee.

After Vincent (Tom Cruise) jumps onto the train in the final sequence, he simply opens the door and walks into the car.

But for obvious reasons, the door out of the last car on any public transportation conveyance (train car, subway, trolley, etc.) is always locked and secured for liability reasons. Vincent would have to kick in the window to gain access to the interior of the train.

When Max calls Annie and his phone is on low battery, the audio on the call gets staticy, not to mention Annie hears the beep. Most cellphone notification sounds aren't heard by the other party. There may be a muting of a second, but that's it. And under no circumstances does a low battery cause static on a line. The call would just be dropped when the battery finally went dead.

During the gunfight at the nightclub, Vincent fires at least seventeen shots from his gun before reloading, even though the USP he uses only holds twelve.

When the duo go to see Daniel Baker the drummer is playing on the hi-hat to his right. But a ride cymbal heard . And the drummer is playing something completely different to the music heard.

When Vincent (Tom Cruise) uses the fire axe to cut the power to his last target's office, the lights go out and her 911 call is cut off.

An experienced assassin like Vincent would know that phone systems run on their own power directly from the phone company through phone lines, so localized interruptions to the building's AC power supply would have no effect on the phone service.

These are not simple phones though, they are powered phones with the option to intercom and transfer calls - they would be powered by mains electricity.

When the body first falls to the windshield, it apparently leaves a lot of glass fragments on the street... but the windshield would be made of safety glass which does not shatter and, therefore, no glass pieces. This is subsequently confirmed throughout the film, as the windshield has been hit but retained on the glass.

However the glass on the road is from the window the body was thrown out of.

In the train car shootout, Vincent and Max empty their pistols at each other and both guns are locked open by design. It appears that Vincent ejects a loaded magazine that couldn't have locked his slide open, however third generation S&W automatics utilize an orange colored follower that would be easy to mistake for a loaded magazine at a first glance.

When Max and Vincent load the first corpse in the trunk, the "corpse" is holding Max by the wrists as well.

The crowd in the Korean nightclub isn't actually running away from the gunshots. They are just sort "milling around" and running back and forth.

This is especially noticeable when Vincent is trying to assassinate his target. Several people in the background don't run away as much as they run to and fro behind him. It can also be seen when Max and the detective make it out of the nightclub's exit as many people around the exit door aren't actually going anywhere.

During the night club scene where there is a frantic evacuation of the building, one of the Asian bodyguards can be seen standing up with people dancing around him instead of the chaotic 'evacuation' being portrayed.

The cartridge shell Richard Weidner holds up in the alley of the first hit is for a rifle not a pistol.

During the car crash when Max intentionally hits the barrier, the trunk never opens despite the taxi cab flipping several times with a body inside. It's still shut tight when the vehicle comes to rest. In the next scene it's suddenly damaged and cracked open.

In the jazz club, Daniel's song keeps playing after he has removed the trumpet from his mouth.

When Max sees the security guard at the office building he runs around to another door. The cameraman is visible in the glare of the building running next to Max.

When the taxi crashes, hidden equipment is visible next to the parked cars, but is removed after the crash.

The cameraman is visible in the mirror Max and Annie are running towards just before they run down the escalators to the subway tracks at the end of the movie.

While driving on a near-deserted road (going to Fever) what appears to be the flashing red and blue lights of a police car (presumably escorting the production vehicles) can be seen reflected in the cab's window.

(at around 1h 19 mins) Light fixture visible in Club Fever.

The lawyer Vincent shoots is supposed to live on Fountain Avenue in West Hollywood. The view from his condo is downtown Los Angeles - about 12 miles from the given address

Annie tells Max to take La Brea to 6th into downtown LA. Max recommends another route, because he says that "once you get to La Brea, north of Santa Monica, then it's jammed." She doesn't question him about this statement. However, she told him to turn east at 6th, which is 2 miles south of Santa Monica Blvd. The route she described would never reach the area with the traffic he's talking about.

At the hospital, Max gets upset once it is revealed his mother is oblivious, believing he drives his own limo, but in reality he is just a cab driver of a taxi. However, earlier she kept calling Max's boss, which would reveal it is just a cab company, not Max's own Limo gig.

As Vincent finds out that Max's mother keeps calling her son through dispatch, he makes a decision to accompany Max to the visit the mother. A professional assassin would have killed Max right there, and look for other, more straightforward options to complete the assignment.

One of the detectives tosses a brass case to Fanning, saying "you can still smell the cordite". Cordite, as propellant has not been used since the second World war and certainly not in modern 45 caliber ACP ammunition. Nitroglycerin, which is a key component of modern propellant, has a completely different smell.

At the end of the film the train pulls out of the station despite a loud gunfight and several witnesses seeing Vincent march from car to car holding a gun.

A trained assassin would never choose to execute a person inside a crowded club, as clubs are equipped with cameras and there would be dozens of witnesses present.

Vincent tells Max that damage to the taxi will be covered by his General Liability Umbrella policy. An Umbrella policy and a General Liability policy are two separate types of policy and collision coverage to a vehicle would not be covered under either.

Right before Vincent first enters the cab, he is wearing sunglasses inside the office building he is leaving. Lateron he does the same inside the hospital. By doing that, he is actually attracting attention to his person, rather than blending in with the crowd.