In the hockey arena scene Paul Walker is hit above the eye with the hockey puck and blood starts coming out, yet in the next scene the blood is coming from the mouth, with no apparent damage to his eye.
When the pimp is talking to the hooker, he cuts her bra strap with his knife, right before she turns to walk away, she is wearing a different dress
At the first shootout at the hotel, everyone is told to slide "whatever they are packing" under the bed. Joey slides his, and in the next shot his hand is still resting on the gun.
In the scene where Theresa finds Oleg with the bag over his head and gives him CPR, there are no "surgical implements" on the closet floor. When she inspects the closet in the next shot, she finds all of the equipment.
When Oleg shoots Anzor and the bullet flies through the window Joey's just asked Nick to throw him a piece of bread. Later on, in the slow motion replay, he's just got up from eating from his plate instead.
When the hooker takes Oleg into the drug store for a new inhaler, he asks for Beclovent. The Pharmacist even says, "Yeah, I know." Beclovent is an inhaled cortecosteroid, not a rescue inhaler. It is of no use during an acute asthma attack (which the pharmacist would know) and is no longer being manufactured in an inhaler form.
Oleg has asthma attacks throughout the film and needs his inhaler to relieve them. In the pharmacy scene, he says he needs Beclovent. Beclovent is a corticosteroid inhaler used regularly to prevent asthma attacks, it has no effect on an attack that is taking place. Beclovent would not provide any relief for Oleg as shown.
When Joey returns home after being shot in the diner, Teresa opens the door to his Mustang and pulls him out. The body of the Mustang is that of a 1967 model, but when the door is open the interior door panels are from a 1968 model.
In the opening scene, the first Jamaican drug dealer is killed during a slow motion shotgun blast. In the shot, the shell is being ejected immediately as the shotgun is fired, which should not be the case as the hijackers were carrying pump action shotguns whereby the shell is ejected upon pumping, not firing.
Blood, like most body fluids, appears fluorescent under black lights. In the arena scene, none of the blood is fluorescent. However, blood does not show up under black light until it a chemical called Luminol is added.
The finish on the gun being hunted (a Smith & Wesson Model 36 with ivory grips) is continually referred to as being either "stainless" or "silver" or "chrome." In fact, the gun is nickel-plated.
When Dez talks to the girl in the "play room" scene, a close-up of her is shown on the TV screen. Then the camera operator starts moving backwards and the camera that feeds the TV screen zooms out too quickly so that the film camera (presumably a Steadicam system) has not yet left the viewing angle of the TV camera and can clearly be seen on the left side of the TV for a moment.