Private Aiello states that tank commander Perez said that the Germans have PAK-38s. Perez stated that the Germans had PAKs, but not which kind they were.
During the mission in the Hurtgen Forest, Lieutenant Turner states that the squad needs to be helped to clear the area. However, the subtitles say that the platoon needs help to clear the area.
Zussman is stabbed on his left flank in the bunker scuffle, but at the aid station and at the beginning of the next mission the wound is on his right flank.
Commandant Heinrich puts a poker into a fire for less than 10 seconds and it already is red-hot. It takes longer than 10 seconds to heat iron to red-hot.
Tracer rounds are shown coming from nearly every gun. Tracer rounds are typically only loaded into machine guns and intermittently, not as every single round.
In one mission, the Player is tasked with flying a P-47 Thunderbolt fighter to escort bombers. The P-47 is shown equipped with 2 bombs. An escort fighter would never carry bombs because doing so dampens maneuverability.
Sgt. Perez says Sgt. Pierson was given an Article 15 and demotion for disobeying orders at Kasserine Pass. An Article 15, non-judicial punishment, didn't exist until the enactment of Uniformed Code of Military Justice in 1951. An Article 15 was less than a court martial, granting a commander officer ways of handling petty offenses with, loss in pay, extra duty, confinement to base or quarters, and in worse cases-reduction in rank. During World War II, such offenses were handled by court-martials that run the risk of time in the stockade and a dishonorable discharge.
When the King Tiger tank is destroyed, the German tank crew that emerges are not wearing anything indicative of a panzer crew. They wear gray uniforms, wear steel helmets and carry rifles. Even the tank commander in the trench coat is wearing an infantry officer's uniform underneath. A proper panzer crew would wear black uniforms. They didn't carrying rifles but Mp-40 submachine guns. They also didn't wear steel helmets.
The reloading animation for the M1919 machine gun shows the loading process, but doesn't show any rounds being put in.
The ammunition counter for the toggle-action shotgun firing incendiary shells is obviously an afterthought.
The bunkers in the Hurtgen forest are too run-down to have been built during the Second World War, and there is no other occasion wherein they could have been built.
A number of NPC soldiers have Asian names. Chinese, Japanese, Filipino, and some Korean-Americans did serve in the US military, though most, except for Chinese-American troops, served in segregated units. Some of these units were deployed to the European theatre.
During the opening narration of the D Day assault, while the camera pans over the battleship Texas executing a shore bombardment fire mission, you can see to radar antennae spinning in the masts. Radar was in its infancy at this time, and while Texas had received one of the first radars in the US Navy in 1939, emitters of the era looked like satellite dishes, not the spinning rectangle we are familiar with today.
Some weapons appear to be anachronistic in location like Soviet sub-machine guns being used by German soldiers on the Western Front. This is not entirely implausible, however, as Nazi Germany repurposed many captured Soviet weapons for use by their own forces, though this was more common for artillery than for small arms and it was more often reused in the same theatre in which it was captured.
Private Zussman calls the Sergeant 'sir'.
German panzerschrek launchers are misidentified as panzerfaust launchers.
Private Howard is seen giving an order to Corporal Daniels, breaking the chain of command, though this could be attributed to the fact that Howard has technical knowledge for repairing the radio and that Howard stated he previously was an NCO who had given up rank to transfer to a combat unit. It is uncertain if the latter was feasible at the time but Daniels and Aiello's initial reluctance to follow his orders illustrates the point.
After landing on Omaha Beach, Daniels destroys an artillery piece by dropping a thermite grenade into a helmet full of Comp B explosives. However, he places them outside the closed breech of the weapon, mitigating the damage it would cause. Later in that same mission, he places a thermite grenade into an empty artillery shell and shoves both into the breech of a second howitzer, thereby properly destroying the piece.
At one point Pierson refers to Col. Davis, the regimental CO, as "Captain Davis".