Continuity mistake: When Hale shoots into the train from the helicopter, he wounds Deakins in the right arm, but later during the movie, the wound is nowhere to be seen. Especially during the fight scene at the end when Deakins takes off his jacket. There's no blood or wound anywhere on his right arm.
Continuity mistake: When Christian Slater and the ranger are radioing for help in the ranger's truck, the enemy helicopter comes from behind a ridge and shoots at them. They get out of the way, and the bullet fire continues and hits the truck on the driver side door, the roof above, and then the ground after that. In the next scene, you can clearly see bullet holes on the hood, going from front to back, but the fire was from right to left.
Continuity mistake: Near the end of the movie, the underground nuclear bomb is detonated, creating shock waves and rippling in the ground beneath the Hummer getaway vehicle. The ripples are huge and come in waves, yet when the explosion subsides, and they drive away, the dirt road isn't rippled or disturbed at all.
Continuity mistake: When Slater has captured the Hummer, Travolta slams into Slater's car which wrecks the right front light. Seconds later when Travolta arrives at the mine the front light is in one piece.
Continuity mistake: After the nuclear bomb is detonated, the helicopter spins out of control and crashes in front of the Hummer. Moments later, a camera shot from behind the Hummer shows the road in front of it to be clear, and the Hummer drives away without the helicopter being anywhere in sight.
Continuity mistake: In the closing fight sequence between Slater and Travolta, Travolta takes out a $20 bill, folded, and sets it under the remote for the nuke. Later, when they show the remote again, the bill is shown unfolded, in fact it is flat. When Christian picks the scorched bill off of the plant it is still flat.
Continuity mistake: When Hale throws the gas bomb at Deakins' hummer, you notice that the damage to the right side of the front end from Kelly ramming the other hummer is magically gone.
Continuity mistake: When Terry and Hale first meet, Terry says "You're under arrest until we can get this sorted out", and puts the handcuffs on his right wrist. When he kicks her off, the handcuffs are on his left wrist.
Continuity mistake: When Kelly fires at the hummer, you see that he punctures the gas tank. On hummers, the gas tank is in the middle of the underside. What he shot was the floorboard.
Continuity mistake: When we see Terry again after her escapee in the river with Hale, her hair and clothes are in perfect shape. Did she have a comb and hairspray on her?
Continuity mistake: Towards the end of the movie, there is a nuclear bomb with a counter displaying a digital readout of the time countdown. After using several different camera shots and angles, the timer displays "26:00" then 18:00" then "23:00".
Continuity mistake: The mine is 600 meters deep. Deakins offloaded the bomb at ground level, started sending the elevator down, and then dropped two hand grenades down the shaft. In the next clip the elevator is at the bottom of the shaft, and the grenades hit the bomb. For that to happen the elevator must have free-fallen to the bottom, not descended as we see it.
Continuity mistake: Toward the end of the movie, after the nuke has been armed in the mine and both groups are driving Hummers, John Travolta switches off the engine and informs his passengers that when the nuke goes off, the electro-magnetic pulse (EMP) will disable any vehicle that is running. Little does John (and apparently the movie's director) know, but EMP will fry any and all electrical circuits, whether or not the vehicle is running.
Continuity mistake: When the helicopter on the train blows up, the boxes that Deakins is hiding behind are on fire. When Deakins stands up, the boxes are not even touched.
Continuity mistake: When Hall (Slater) and Terry (Mathis) fight on first meeting, he cleverly yanks her gun out of her holster as she kicks him away. However in the next shot she draws the gun out of the holster.