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
Continuity mistake: There is blood on Samantha's gloved hand when she presses the keypad, but there is no blood on the keypad after she removes her hand.
Corporal Dean Portman: I'm gonna lock myself in a motel room with a bottle of tequila and three she-boys.
Trivia: The marines activate "Kill cams" on their weapons. Doom's precursor game by id, Wolfenstein 3D, had a feature called Kill Cam, which was an instant replay of sorts against certain boss characters.
Question: In the end of the movie, why did Reaper grab the BFG? I could see the stock of the gun sticking out from behind him. It had no more ammo left, so what's the point?
Answer: From what I know, that gun is now basically a working prototype, it would a nice thing to have. Also, it could be adapted to the RRTS (Rapid Response Tactical Squad) needs. Or just as likely, the UAC wanted it back.
Todd Loewen