The Smith & Wesson as used in-game uses .45 ACP ammunition. This pistol is only chambered for 9mmx19 ammunition.
The 9mm Makarov pistol holds but 8 rounds; in-game it holds 9 rounds.
Meters are used in dialogue. The U.S.A. uses yards and feet rather than meters.
Enemies that carry the Tokarev pistol drop 9mmx19 ammunition when they are defeated. The Tokarev pistol fires 7.62mmx25 ammunition.
The U.S.A. uses the metric system in the game. As of 2020, the Imperial system is still used by the U.S.A.
The F4 Phantom II jet aeroplanes that attack the factory do so with bombs. However, they do not have any bombs mounted upon them.
In the stream mission, Sergeant Hawkins comes upon a trap, stating that it is a U.S. grenade in a beer can. The can is a tin can, not a beer can.
At Bahnur village, if you tell Nhut to advance Sergeant Hawkins says 'Take me to the village' - referring to the village wherein you already are.
The characters use meters in this game. The U.S.A. uses yards and feet.
The Baikal IZh-43 shotgun found in the game was introduced in 1986.
During the stream mission, someone says 'Looks like we were expected here, Sir'. The Player is a sergeant, not an officer; therefore, he should not be called 'Sir'.