Other mistake: The chaingun was actually a heavily dressed up Browning Browning Model 1919 machine gun with a fake rotating barrel cluster surrounding the real firing barrel - in several firing scenes a careful eye will notice the barrels are not even rotating.
Doom (2005)
1 other mistake
Directed by: Andrzej Bartkowiak
Starring: Dwayne Johnson, Rosamund Pike, Karl Urban, Ben Daniels, The Rock, Deobia Oparei
Visible crew/equipment: When the woman is performing an autopsy on one of the dead "creatures" the lights supposedly flicker and turn off. There is a hand visible flicking the switches on the lamp to the right side of the screen. (00:45:40)
Pinky: You don't look like a "Mac."
Mac: Katsuhiko Kumanosuke Takaashi.
Pinky: So, Mac.
Trivia: At one point Sarge tells his men to kill the remaining civilians to prevent the infection from spreading, an order which they all refuse. According to the back story of the first Doom game the reason the main character was sent to Mars in the first place was because he refused an order to kill innocent civilians.
Question: The scientists of the genetic research lab were first attacked by the Hellknight monster, which was actually the human test subject. Since after the incident the research lab was quarantined and the first Hellknight could have gone nowhere, how is it that the Marine troops didn't encounter the first monster even once when they entered the genetic research lab?
Answer: This is explained by the fact that it was likely hiding, waiting to see what the RRTS would do. After all, the human test subject still had its personality, as far as is known. It would've waited to discover their weaknesses, stalking them like a predatory animal stalks its prey.