The beginning of the game has Tommy Conlin being trained at Camp Pendleton Marine Boot Camp in 1940. Camp Pendleton was not used as a Marine Base until March 1942, after WWII already began. Marine recruits were all trained at Parris Island in South Carolina before 1942.
The Type 99 Light Machine Gun used by the Japanese troops in the game is incorrectly named as Bren. The Bren Gun was a similar looking light machine gun used by the British army during the Second World War. Interestingly the Bren can be seen in the game Medal of Honor Spearhead, in which it is mistakenly named as Vickers, which was the name of another World War Two era machine gun.
Tracer ammunition was rarely issued to any weapon except for machine guns.
Birdsong can be heard at nighttime. Birds keep quiet during nighttime.
The loading animations are wrong. Notable is that the bolt-action rifles are loaded with clips instead of strips.
The 1.1 inch gun has impact-fuzed rounds only and the rounds do not air-burst as depicted.
The game operates around a system where the Player is commanded by one of the NPCs. This is how a military command system works. What isn't right about the way the game works is that other NPCs shout out conflicting orders and false information when it is the job of whoever is in command to do so.
The maximum ammunition capacity of each weapon should be a multiple of the maximum capacity of each weapon's magazine since no-one carries partial magazines around if they can help it.
At Tarawa, there are marines with Springfield rifles. The M1 Garand rifle was standard issue by then.
The M1 Carbine was not issued until after the Pearl Harbor attack.
In the jungle background noise, a bird known as the 'screaming piha' can be heard. These birds can only be found in the Americas, not in the Pacific Islands.
For some reason, only Private Conlin is told to leave his weapons behind at training.