Factual error: The United States Air Force does NOT, ever, allow its pilots to box competitively! Ground staff, yes; pilots, no, never. A pilot can be suspended from flying if he/she receives a blow to the head in day-to-day life; boxing is right out. Almost all air forces (the RAF included) impose this rule.
Factual error: EMP is mentioned as a threat, but only atmospheric blasts generate EMP fields that affect large areas, not subterranean detonations.
Factual error: When Travolta is deep down in the mine shaft, he uses a two-way radio to talk to his guys upstairs. I know from personal experience, and from being in the military that two-way radios, no matter how much power output they put out, cannot talk for more than 100 feet max in an enclosed area such a mine with thick walls, let alone 2,000 ft (the distance the elevator travels in the mine).
Factual error: Despite what movies keep telling us, you cannot manually arm a nuke taken from a missile or bomb. A device called an accelerometer measures the speed of the flying/falling weapon and arms the warhead. It cannot be done on the ground. The warheads are specifically designed to make stealing a warhead and arming it by itself impossible. Deakins is a pilot, not a nuclear technician. He would need to disassemble the nuke and rebuild it completely to make it detonate. These features are designed so that bypassing/disassembling them DISABLES the nuke completely, making it completely unusable for just this reason.
Factual error: During the scene on the train when Hale arrives in the helicopter, Deakin and Kelly shelter themselves from the incoming fire by hiding behind the walls, and manage to avoid taking any hits. This is odd considering they're sheltering not only behind wood walls, but wooden slats. The M16 with its 5.56mm rounds would easily penetrate the wood, let alone pass through the gaps, and injure, if not kill, our lovely villains. Even if they magically escaped unharmed, there would be bullet holes visible inside the train carriage, but these do not exist when the camera pans through it. Indeed, later on the train, Kelly fires a shotgun which happily penetrates the sides of the carriage. There is no reason an M16 would not be able to.
Factual error: During the shootout on the roof of the train, the antenna is blown to bits. The antenna should be made from fiberglass, but is made from wood...