When Narville is freed, he is handed an StA52 from a fallen Helghast. Soon after, when they are fighting their way out, Narville is using an M82.
Sergeant Sevchenko is referred to as a corporal in the beginning by Captain Narville even though he is a sergeant.
The setting varies significantly between the beginning of the game, and when the beginning is repeated.
The front sight of the ISA's main rifle isn't visible when aiming.
Sergeant Velasquez says 'This one's on me' at one point; however, the subtitles say 'This was on me'.
The dropships have three flaws, all stemming from their having no enclosed troop compartment: first, the lack of a troop compartment means that the troops could fall if subjected to evasive manoeuvres; second, they would be subject to enemy fire; third, they would have no protection from high altitude conditions.
The way the front jets on the jetpack are mounted should be too hazardous to the operator.
Gas renames can somehow affect Helghast despite the Helghast wearing suits with breath masks.
The ETA of a bombardment on the arc cannons starts before it is announced.
When Sergeant Velasquez and Sergeant Sevchenko go to rescue Captain Narville while disguised as Helghast, Sergeant Sevchenko is carrying his usual light machine gun. Since this is not a Helghast weapon, it should alert the Helghast.
Allied troops are somehow present on the mobile factory with no explanation as to how they got there.