A poster for the Volksturm is visible in the Sicily Port mission. This was a militia formed towards the end of World War II, whereas the mission takes place in 1943.
Sniper rifles cannot be reloaded with stripper clips due to the location of the scopes.
Flak 88 guns make an electric motor sound when traversing. Flak 88 guns are manually traversed.
The sirens used by the Germans should be lower pitched than they are in the game.
When the Player uses a 20mm anti-aircraft gun to shoot down enemy aeroplanes, the shells explode in midair. German 20mm shells of the Second World War only exploded on contact.
The Player is given 18 rounds for his M1 Garand rifle at the beginning of the U.S. campaign. Given that the Garand is loaded with 8 round clips, the Player should have been given a full 3 clips instead of 2 clips and 2 rounds.
When an enemy rocket is fired, friendly NPCs call it a grenade.
In the S.A.S. Mission to destroy the guns, there are the guns, and there is a magazine for the guns. However, there is no way to bring ammunition in and out of the magazine or to the guns.
Major Ingram is shown firing a revolver while driving a motorcycle. It would be extremely difficult to reload a revolver if riding a motorcycle.
The Lee-Enfield No. 4 Mark 1 rifle can be seen being used by Dutch Resistance troops in 1941. This model of rifle was not even in widespread service with British troops yet, and certainly wouldn't have been in use by the Dutch Resistance.
A Soviet soldier says that the Germans must be driven from Russian soil. By the time he says this, the Soviet Union is no longer fighting in Russia, having advanced into the eastern Soviet republics.