A motor can be heard when using a FLAK 88. FLAK 88 guns are traversed manually.
The Player is tasked with destroying guns firing at the beaches. These guns are direct-fire 88mm guns which cannot fire at targets unless they are in line-of-sight. Further, they are firing too fast for manual loading guns.
German sirens should be lower pitched than they are portrayed.
Soviet soldiers are shown using German pistols.
The only German bombers seen are the Focke-Wulf Kondor bombers. These were used for maritime duty and were not typically used inland.
Searchlights can be seen moving without anyone manning them.
The M1A1 Carbine in the game has an anachronistic adjustable rear sight, only fitted post-war.