Hale shoots Deakins in the arm from the helicopter. During the helicopter explosion sequence and the boxing match, there is no bullet wound on his arm.
When the park ranger is handcuffing Hale, her gun is drawn. When he kicks her over his head and pins her, he draws her already drawn gun from her holster.
The first bomb countdown changes from 23 minutes to 26:33.
During the fight on the train, the shadows cast by the sun keep switching from one side of the train to the other.
Before the flight, Hale states that the airspeed will be .7 Mach which is approx. 540 mph. But during the flight, he states to Deakins that their airspeed is 800 mph.
Military pilots aren't allowed to box due to the risk of head injury. Any loss of consciousness will DNIF (Duty Not Including Flying) a pilot and require a medical review. Especially the fact that Deakens and Hale are boxing without wearing protective headgear.
Turning off electrical equipment does not protect it from an EMP.
A nuclear explosion could not be passed off by the government as an earthquake. Non-government seismographs around the world would be able to tell the difference between a natural earthquake and a nuclear explosion.
The UH-1H (Huey) helicopter that shoots at Hale and Terry is designed not to explode if it crashes. The tail rotors would not have sparked when bouncing off the rocks, they would have shattered.
An underground nuclear detonation does not cause an EMP.
The phrase "PINNACLE - BROKEN ARROW" is not actually used to refer to the
theft, loss or seizure of nuclear weapons or components from the U.S.; that's known as a "PINNACLE - EMPTY QUIVER". A "PINNACLE - BROKEN ARROW" is the situation when a warhead has been accidentally detonated or jettisoned (not risking nuclear war). Although at the time the phrase was used in the film, it was assumed that the nuclear warheads were jettisoned and the crash was due to pilot error, and the weapons were not stolen.
An EMP would not have affected Deakins' electronic wristwatch. This was specifically addressed in a 2010 technical report written for the US government's Oak Ridge National Laboratory, where it says "A watch is much too small for HEMP to affect it."
Terry's wet clothes and hair get dry because it's a sunny day in the desert. You can see her hair looking progressively better from one scene to the next.
Carmichael tells Hale that the mine shaft is 2000 ft deep. There are various related errors, such as how long the elevator takes to get up and down, but the most egregious error is that from the bottom of the shaft, they catch an underground river which flows them "up" to the river outside.
When the helicopter shoots the park ranger's truck, an implausible explosion erupts from under the front of the vehicle. The gas tank is at the rear of the truck.
Hale would not have been fooled by Terry's claim that her pistol was not loaded. First, a trained serviceman would recognize the difference in heft that an unloaded weapon had in his hands. Second, since the gun was a revolver, Hale would have very easily been able to see while holding the gun whether or not the gun's cylinder had shells in the chambers.
When Hale and Carmichael enter the underground river they are supposedly 2,000 feet below the surface. But the river is shown to be lit by direct sunlight.
When the nuke hits Deakins and blows him out of the train car, there is a very quick shot of a dummy switched out for the actor before impact.
The load weight of a B83 Thermonuclear bomb is 2408lb. Even with the outer "skin" removed, they'd be far too heavy for any character or an old-fashioned service elevator to carry.
During the pre-flight briefing with the General, behind him on the wall is a poster of an F/A-18 Hornet. Seeing as that particular aircraft is only flown by the US Navy and Marines, it seems VERY unlikely that a picture of a Hornet would be in a US Airforce briefing room.
When the helicopter shoots at the Park Ranger vehicle it is attacking from the vehicles left, drivers side, but when it flips over from the explosion the hood shows bullet holes going from back to front, not side to side.
Master Sergeant Kelly's nuclear weapon retrieval team wears the six-color Desert Battle Dress Uniform, in the "Chocolate Chip" pattern. At the time of the film's release, these had been replaced years ago by the three-color Desert Combat Uniform, the "Coffee Stain" pattern.
When Terry swings from the train compartment handle a harness cable is visible.
Train was supposed to be going east, train appears to be heading west. Shadows on wrong side of train (unless Denver has moved to the southern hemisphere).
In the course of a single day the characters somehow cross nearly the entire length of Utah despite numerous delays and being limited to using only backroads.
Parachuting out of a disabled plane is not a crime, even if you do land in a national park.
When Hale's attempt to disarm the bombs by entering the wrong codes three times, Deakins tells him that it won't work because he used "uncoded circuit boards". But the Permissive Action Links of the B83 cannot be disabled like so; by just yanking out some circuit boards and putting in new one. Tampering with the PAL this way would on its own disable the weapon. Also the B83 requires additional input to arm the weapon. In short: the scenario is nonsense because it was anticipated a long time ago.
Deakins escape helicopter can only carry one or two men, and it's obvious. The rest of his crew would be stuck on the train.
Deacon's plan seems rather pointless, since he revealed himself as the one who stole the nukes. How does he plan to spend that money if they already know it's him.
During the nuke, Deaks explains that the EMP shuts everything electronic down, radios, cars and yes even his watch. If this was the case, then his watch also would have stopped working, yet Deaks looks at his watch and says "We're 10 minutes behind".
Hale remarks after the nuclear bomb detonates that they are safe because no radiation escaped. That is false. The detonation of the bomb in the mine produced a visible fireball, which means that the blast was not contained. The fireball/dust cloud is laced with plenty of fresh radioactive substances. They are safe as long as they are upwind from the mine, not because "no radiation escaped".
Deakins makes two errors regarding reconnaissance satellites: 1) They can't "change orbit" - once they are set on their orbital path by the rocket that launched them, that's where they stay indefinitely, or until they de-orbit; 2) He says the next satellite is two hours away - Low Earth Orbit spacecraft (like recon satellites) orbit the earth every 90 minutes.
During the opening fight, Deakins tells Hale he just hit him with a left, left, right. Except, he didn't. His punches were left, right, left, right.