Other mistake: When Ace rescues the dog and replaces it with a toy dog, the toy dog is in an impossible position. Ace had to place it there when the door was still open, but if the door was closed after that the man would have knocked it over. (00:03:25)
Revealing mistake: If you look at the missing part of the bridge, and look at the shadow underneath, the shadow is of a full bridge. (01:02:35)
Continuity mistake: In the scene at the bar with Gideon when the black guy pours Gideon a drink it is only about 1/3 full. When Gideon drinks it in the next shot it is almost full.
Factual error: The terrorist with the AK47 is unaware of the fact that a Harrier is hovering just outside the window until he slowly turns and see it there. He does a double take when he sees the Harrier just five metres away! A Harrier is an incredibly loud aircraft; you can hear them from three kilometers away. At that range the floor would shake with the noise and he would have been in no doubt whatever that he had been under attack for some time.
Other mistake: As the Veridian star is destroyed, Picard raises his hand to supposedly shield his eyes from the sun's light, but he is looking in the wrong direction; the sun is behind him, and there is no light on the rest of the front of his body.
Continuity mistake: In the movie Christie Swanson drives a BMW 3 series coupe. In the scene where they were making love the car suddenly changes to a four door model then back to a two door. (00:06:10)
Continuity mistake: At the end of the movie when the mob guys come to the boat house to move the body, Barry the Blade shoots a raccoon with his gun which has a silencer. But, later when Reggie shoots the neighbor's alarm system with Barry's gun, it does not sound like it has a silencer anymore.
Suggested correction: The silencer fell off the gun when "the blade" tackled the kid and Reggie. They show the silencer falling off the gun into the leaves.
Factual error: A bunch of troops are in heavy camouflage in helicopters, going to an assignment. The officer in charge tells them to take their dog tags off and empty their pockets of anything that could identify them. This is silly: first, in troop helicopters, the troops wouldn't be able to hear the officer's voice - it's too noisy - and second, this would be ingrained in them, to remove dog tags etc, and would have been done back at the base, before they left.
Deliberate mistake: Twice in this film Axel is shot at by multiple gunmen using automatic weapons at close range - and they all miss. In the Earthquake theme ride the bullets ricochet of the rails at Axel's feet. Why are they all aiming low? Why don't they raise their aim? In the park outside he hides behind a perfectly ordinary park bench and the bullets hit the wooden slats. Not one goes through the open spaces between them? I know bad guys can't shoot straight in the movies, but this is ridiculous ...
Continuity mistake: In the film Jeff Douglas is out to kill the five leading kingpins of "the Hand". After he gets the first three, he goes after the last two who are hiding together. But the two fall out and one (Manter) shoots the other one (Kowalski) dead. Later, when he catches up with Manter, he doesn't kill him but lets him live to face justice (though he does die at the end). After catching Manter, he acts like it is the end of his "quest", yet does not know that Kowalski is already dead, and therefore should be out looking for him, not stopping at Manter's capture.
Visible crew/equipment: When Julie says "It's probably just your nerves" then Heather replies "Nerves?!", above Heather's head you see a boom mic dip down into view. (00:12:25)
Continuity mistake: At the beginning of the wedding day scene when Mallory is throwing the red doll off the bridge, her nails are long and manicured, but later in the same scene you can see that they are bitten down to the quick. (00:19:55 - 00:21:50)
Continuity mistake: After Leon rescues Mathilda from the SWAT team and dodges the snipers, he shoots out a ventilation fan to make an escape route. He gets off two shots before we see the vent, but when it does we see about 7 bullet holes around the vent. Then the camera goes back to Leon as he continues firing. When the camera switches back, the holes around the vent are different. (01:27:05)
Factual error: We're told they carbon dated the gold to determine its age. Problem is, the gold hasn't aged by the normal processs - as it's been brought forward in time it will appear to be extremely new. As such carbon dating wouldn't work. Also, carbon dating only works on things that were alive and absorbed carbon-14; gold, having never been alive, could not be dated this way.
Continuity mistake: In the very first scene when Seagal first gets off the helicopter we see that he's wearing a navy blue shirt tucked into his jeans. In the next shot he's shown wearing the yellow suit but instead has a white shirt on underneath instead of the navy blue one.
Visible crew/equipment: A boom mike is reflected in the car window, when Alex pushes Hugo's car into the lake.
Continuity mistake: In the beginning of the film when Jack Nicholson hits the wolf, his car spins around 180 degrees in the snow, but there are no marks from the wheels in the snow when he approaches the hit wolf. (00:03:25)
Continuity mistake: In the scene when Rudy is holding a colt python to the hotel owners nose, in the next shot, the gun suddenly changes to a smith and wesson revolver.
Continuity mistake: When Tommy Lee Jones pops into his local Irish boozer for a pint of what is supposed to be Guinness, it is clearly not a pint, it is clearly not Guinness (flat Coke, more like), and the level of said beverage in the glass fluctuates wildly and out of synch with TLJ's swigging.
Factual error: There is a shot with Wesley Snipes and Gary Busey aiming one another just to pull the triggers and discover that the guns are out of ammo. In fact, after the last shot (of the pistol, not the movie) the slide of a semi automatic pistol is retained open by the empty magazine, and doesn't return forward as we can see in the shot (of the movie, not the pistol). The reverse mistake is very common in movies, when the armorer loads just one round to be shot (in the movie as well as the gun) and the actor keeps fighting or menacing with an unloaded, breech opened gun.