Continuity mistake: When she goes through the lasers it takes 2 minutes to get to the mask, but it only takes 30 seconds to get back.
Revealing mistake: When the house has been locked down at the beginning of the film no moonlight could come in, however when the guests are being shown the coffin with the guns in there is a shaft of bright moonlight shining on to it.
Factual error: The priest says that St. John saw the number 666 in his vision, but it was actually 999 inverted. St. John wouldn't read modern Arabic numerals like we do, it would be Roman numerals. The number 666 would actually be DCLXVI. (01:05:40)
Continuity mistake: When Nicholas Cage is being escorted to fetch the roll of film from his car, there are a few scenes where the accountant is holding a gun to Nicholas's head. When the camera is directed at the accountant, two hands can be seen grasping the gun, but when the camera is facing Mr Cage, initially there are two hands but after the next switchback there only appears to be the one! (01:20:50)
Continuity mistake: The tape is labelled "Vincent Grey" in the first shot, but the label disappears in the next shot. (01:11:32)
Continuity mistake: In the flashback to the death of the headless horseman, when the horseman's steed gets shot and falls to the ground, the blood and the wound are on the right side of the horse...later in the scene when the horse is seen again, the wound is on the left side of the horse. (00:16:45)
Continuity mistake: Right after the Rabbi is shot in the beginning of the movie by Dominic, we see the two prophets check to see what was taken from the office. We can plainly see the dead Rabbi take two deep breaths during this scene.
Continuity mistake: At one point about three-quarters of the way through the movie, when Lowell Bergman (Al Pacino) and Don Hewitt (Philip Baker Hall) are talking, watch in the background as a certain lady walks past after Don says something. When we cut back to him he says something else, but the same woman in the background appears and walks exactly in the same direction, just like in the previous cut. (01:52:35)
Continuity mistake: When John Travolta is searching the dead woman's house he has latex gloves on. When he pulls out his gun and heads into the basement, his gloves are gone when he turns on the light. Then they reappear a few seconds later.
Revealing mistake: When the Japanese tanks are firing upon Godzilla, one of the pyro effects catches the Godzilla suit on fire (at the arm). One can see the stunt man begin to frantically shake his arm upon this realization before the editing cuts to another shot.
Visible crew/equipment: A boom mike drops into frame during Jay Mohr and Scott Wolf's dialogue at the supermarket.
Continuity mistake: In the photo of Eye's daughter, there is a fold. When it is shown in close-ups, the fold moves around.
Continuity mistake: At the end of the movie when Michael chases the delivery truck in a red Ford Contour, he crashes into a bus and the car spins several times. If you watch closely you can see that after the crash the left headlight is very badly damaged and the right one is missing, but the next scene shows the car almost undamaged.
Factual error: When Sheriff Emmett Kimsey (Lou Diamond Phillips) and Dr. Sheila Casper (Dina Meyer) enter the mine shaft and fall down into the cavern full of guano, they light a flare. The flame would have caused the fumes to ignite.
Continuity mistake: When Molly ties Tanya's whip around a bar to let herself down from the air duct, you can see as she slides down that the whip is knotted at intervals. But a few moments later, when the severed hand draws the whip back up, you can see that there are no knots in it.
Revealing mistake: When Jamie Lee Curtis falls into the fuel tanks, how could she be breathing? The gases would be too toxic for her to breath, and wouldn't she be blinded by the fuel?
Continuity mistake: When Richie is running down the stairs, there's no vomit on left hand, but when he asks for a handshake from the policeman, there is.
Other mistake: When the one-legged judge bends over to retrieve his wooden leg from Paul Newman's grandson, you can see the judge's real leg and foot sticking out behind him.
Factual error: When Cy Coates is impaled on the terrace guardrail, we see a shot of various emergency vehicles in front of the building, including FDNY Rescue Company 4. Rescue 4 is the rescue company for the borough of Queens; the movie takes place in Manhattan, so Rescue 1 would have been the unit that responded.
Factual error: Set in the summer of 1977, serial killer David Berkowitz is seen throughout the film wearing a US Army woodland camouflage pattern field jacket. The Army did not start using these jackets nor were any ever made until the early 1980's. They were all solid green until then.