Continuity: After Buddy cuts Common's character across the eye with a playing card, the amount of blood on Common's face changes as the camera cuts away and cuts back again.
Continuity: When the hitman Lazlo Soot disguises himself as Hugo, there is a rather large blood stain in the middle of his shirt. Later when he ditches the disguise the white shirt has no blood stain on it at all.
Continuity: When one of the prostitutes grabs Buddy's dressing gown, he lets it fall onto her, covering her legs. From one viewpoint, the dressing gown covers the prostitute's legs, and from another, she is still completely uncovered.
Continuity: When Sparazza kills Heller there are two holes in the cars window, Sparazza makes another, third. In the next shot there are four, and when Sparazza walks away, again only two.
Continuity: In Buddy Israel's hotel suite, the naked prostitute on the floor is completely naked. Then, she is covered with a black blanket. She is then shown naked again, and then covered up again.
Continuity: Everytime they flashback to Heller being shot, the number of bullets in the driver side window changes. While this is a continuity error, it might be intentional to illustrate the confusion an inconsistency combined with how little the FBI actually knew about the incident.
Crew or equipment visible: Right after Israel tries to commit suicide the camera pans past him, past the revolver, and up to the door which changes into the door the security guards open. The reflection on this door clearly shows the outline of the camera man walking up to the door.
Crew or equipment visible: When the Tremor brothers are in the elevator, trying to escape with a chain saw, there is a close up on the tallest member. When this happens, you can see the camera reflected behind him in the upper side of the elevator roof, in the shining material.
Continuity: When the camera pan out after Watters emptied the sniper rifle, the rifle had no magazine in the receiver. But later when the FBI stormed the room the rifle had a magazine attached.
Factual errors: The Swede is supposed to have come from "Stockholm University", Sweden. This is not possible as it is the Karolinska Institutet that is the university hospital of Stockholm where medicine is studied and researched.
Errors made by characters (possibly deliberate errors by the filmmakers): When Hollis Elmore gets to the house and the kid, Warren, opens the door, the American Flag in the background is hanging wrong. The American Flag is always supposed to have the stars in the left corner; the one in the house, the stars are on the right.
Continuity: Early in the movie Agent Messner is talking to his partner and says "and a paternity suit just to round out the portfolio". At the end of the movie they are recapping and show him saying "a paternity suit just for fun".
Crew or equipment visible: Just as Messner goes up in the elevator to see Locke at the Hospital, a reflection of a crew member is seen to far left wearing headphones.
Continuity: When Buddy shuffles the card deck he has a ring in his right little finger. Then a camera turns away and come back, and a ring is gone.
Continuity: When the hit man is disguised as Hugo and is placing his collection of tools on the bench, the order changes.
Continuity: One of the cords that Richard Messner had previously unplugged from the wall is plugged in again, when he is sitting in the chair in the hospital room at the end.
Factual errors: When Watters empties the sniper rifle, count how many shots she gets off. The Barrett M107 only has a 10 round magazine, even if she has one chambered she still can't get off the 13 shots that she does!
Factual errors: At one point, Heller is said to have been OSS (Office of Strategic Services) before he was FBI. At another point, it is said that his undercover op predates the second world war. This is impossible, as the OSS was founded in 1942.
Continuity: When Agent Messner first walks into the Emergency room you see a doctor pass from the hallway in front off to his left. The camera then pans to look at him while he is walking down the same hallway, and the same doctor walks along the same route as before.
Continuity: Israel's pattern of rings changes throughout the film - in some shots he wears one ring on his left pinky and one on his right index finger, but in others a third ring appears on his right pinky.
Factual errors: When Agent Messner unloads his duty weapon in the hospital, he ejects a live round. The sound of the round hitting the floor, though, is that of empty brass.
Continuity: Darwin lifts his left hand to open Jack Dupree's eyes, in the next shot his right hand is holding the eyes open.
Continuity: When the Tremor's roll down their windows to shoot the Bailbonds men, Darwin is seen with some sort of band on his left wrist. When he gets out of the car both of his arms are bare.
Factual errors: FBI agents wouldn't randomly open fire in the general direction of the 50 caliber gunfire due to risk of public safety; There would be no telling where their bullets would hit. Even if they knew where to shoot, which they didn't, at that range a Glock (or any handgun) is totally inaccurate, not to mention it probably wouldn't have enough stopping power left to do anything.
Continuity: In the penthouse, when the prostitutes are being hustled out, the one in gold falls through a glass table as she's trying to put her boots on. When she gets up, there is no glass or no blood visible on her back. Falling into anything glass would cut a person to shreds.
Anachronisms: In various places throughout the movie it is indicated Heller was shot in 1952, but he is shot near a 1956 Ford.
Continuity: The Tremor's shoot-up the Bailbonds men in the parking lot, bullets flying everywhere from automatic weapons. Later we see that whilst the Bailbonds men's car has smashed windows, there are no signs of any bullet hits to the body of the car.