Doom

In the scene where Goat comes back to "life", the wounds and blood on his face/neck switch sides.

When Reaper sees 'Lucy' in the laboratory, his earpiece switches sides from right ear to left ear when the shot changes from his close up to showing him and his sister.

When Sarge makes his first jump up onto the stairwell in the final fight with Grimm, the two wires which lift him are visible.

Goat's eyes open and close between the time he dies in the sewer to when he is seen lying in the med-lab.

When Sarge punches through the glass sign during the finale, pre-cut lines (making it easier to punch through the glass) are visible on its surface.

In the bathroom stall just before Portman dies, the screen shows what he is seeing.

The view of the gun on the right side of the screen, suggesting it is being held in a right handed manner, Portman however holds his weapon left handed.

When The Kid asks Portman for the "Game Face" Pillswhen Portman drops the pills into Kid's hand, all but the 2 that drop out are glued securely inside the bottle.

When Portman and Goat check the chemical levels in the airlock, Portman mentions magnesium, chromium, and lead.

We see his "chemical detection" device, and in the order he stated, follow the symbols Mg, Cr, and Ld.

The symbol for lead is not Ld, but Pb.

However, this is not necessarily a goof, since the device is not labeled as a Periodic Table, and the display may be "dumbed down" for common usage by lay people.

"Ld" is a reasonable abbreviation for Lead for people without a chemistry or Latin background (Latin for metallic leadPlumbum).

During the fight between Sarge and Grimm, when Sarge spins Grimm around and throws him on the computer console, the console is made out of cardboard.

The hand held video game Duke is playing (Galaxian 2 by Entex) is meant to be played holding the game vertically, one side of the buttons control the ship, the other side the Galaxians.

Duke is holding the game horizontally, playing both sides at once, while seeing the action sideways.

When Reaper, Sarge and Sam are watching the video file from UAC's human subject test, the time-code on the screen first starts out at 2:23.

After a quick shot of all 3 actors, the timer then reads 2:33, then 2:34.

It then instantly switches to 3:24 without any apparent fast forwarding of the video.

After another quick shot of Sarge, the timer then starts at 2:27.

When Destroyer is battling the Monster in the holding cell, he is thrown against the wall.

When he stabs the monster and it relinquishes it's hold, Destroyer does a back-flip off of the wall.

This is impossible as his back was to the wall.

When the Monster grabs Pinky, Reaper and Sarge go after it.

When they round the corner, they fire their weapons through a Nano-Wall at the monster.

However, in the next scene, the Nano-Wall disappears, then re-appears when the horde of zombies arrive.

No Marine would ever refer to a sergeant of any rank as simply "Sarge.

" This is only done in the Army and the Air Force.

However, this could be because it is the Sergeant's "battlefield nickname", considering several other members of the squad are also called by nicknames.

When Duke learns that Reaper and Samantha are twins, he wonders if they're identical.

Identical twins are always the same gender, because the embryos come from the same fertilized egg.

When Mac is decapitated, Sarge demands a response from him.

If the English subtitles are activated, the Sarge's dialogue is attributed to Mac.

When Duke and Samantha are talking while she's examining the creature (right before he goes to get the power bone saw), he corrects her by saying the Marine term is 'Hooah,' when in fact it's 'Ooh rah'.

'Hooah' is an Army term, not a Marine term.

Throughout the movie, Sarge calls the Marines "soldiers.

" In reality, Marines are deeply offended when they are called "soldiers.

" Soldiers are Army.

Sarge being called Sarge implies that he is obviously ranked a Sergeant.

During the film Reaper addresses Sarge as 'sir'.

In all military services Sergeants are Non-commissioned officers and are only allowed to be addressed as sergeant not sir.

Later in the movie, Reaper throws a proximity mine and the Monster explodes.

However, Reaper is standing only about 3 feet from the mine, so he should've been hurt by it.