The pistol that Mr. Mason picks up in Vorkuta had several rounds fired from it, but when he picks it up only one round is missing.
At the end of the game, Mason and Hudson are shown escaping from the Soviet submarine station by swimming to the surface without the benefit of scuba equipment. Not only is this impossible, given the pressure at that depth and the time it would take to reach the surface, it would also leave them with a serious case of decompression sickness.
The M72 LAW, in reality, cannot actually lock onto vehicles.
Unless Dragovich implanted a radio somewhere in Hudson's body, which is doubtful, there is no way that he should be able to hear the numbers broadcasts, which are radio broadcasts and as such require the appropriate equipment to receive.
The Vorkuta uprising actually happened in early 1950s rather than 1963.
Climatic M-134 "Minigun" is a mount-only weapon (due to it's own weight, power requirement, large ammunition consumption and punch-back when firing at about 4000 rounds per minute) and cannot be used by foot-soldiers.
During the mission "S.O.G." when Mason is calling on the radio for 'Priority One Ordnance', his voice actor Sam Worthington accidentally reverts to his real-life Australian dialect.
Grammar mistakes in subtitles.
Weaver already has an eyepatch on when he is rescued despite never having time to put one on.
In the Hue mission Woods takes a SPAS-12 shotgun from an N.V.A. soldier and shoots two others with it. He then tells Mason that it would hold Mason's incendiary rounds. Woods only fired 2 rounds, yet all of the rest of the rounds in the shotgun are Mason's incendiary rounds. Also, if Mason had incendiary rounds, he should already have a weapon for them.
The reel-to-reel tape player playing Kravchenko's voice in the Vietcong tunnel has no tape on it.
When Mr. Hudson storms Mount Yamantau, he cocks his rifle. The only thing that does is eject a perfectly good round.
The subtitles call the relay dish at Mount Yamantau a radar dish.
Nearly half of the weapons, such as the Steyr AUG, MP5, FAMAS, H&K G11, MAC-11, SPAS-12, CZ75, Galil, WA-2000, L69AW, Kiparis, and the PSG-1 are available in game long before they were actually made.
Many allied and enemy soldiers are seen fast-roping from helicopters from certain parts in the game. The game takes place in the 1960s and the fast-rope technique was never used until 1982 by the British during the Falklands War between the UK and Argentina.
The plane that flies overhead is a Boeing 747 on final approach to Hong Kong International. The date for this level is February 9, 1968, the Boeing 747 was not introduced for commercial service until January 22, 1970 with Pan Am as the launch customer.
At the loading segment preluding to the "Numbers" level, a small Hong Kong flag can be seen, the current white Bauhinia flag on a red background shown on the screen did not come into use until 1 July 1997.
In the first level in the bar, the song Quimbara by Celia Cruz is playing. That song was not around at least ten years after this level was set.
In almost all maps only Russia and Kazakhstan are added territory of the Soviet Union. In real Soviet territory includes also 14 other republics witch are "independent" in the maps. Also most of the maps show current political borders instead Cold war era borders.
A few Cuban police officers will sometimes take out an ASP pistol, despite the fact that the ASP was only issued to Special Forces units.