- Continuity: Ricky delivers pizza to Jesse's house, 1472. The number on the light post outside when he arrives is 1012. Later in the sewer to find his car keys, the markings show he's underneath the 1400 block of her street.
- Continuity: The M4 Carbines wielded by the main characters are seen firing off more than their 30-round magazine without being reloaded.
- Factual errors: When Kelly comes home from the Army, she brings with her a set of Night Vision Goggles for her daughter. In reality, it is forbidden for a soldier to "bring home" any military equipment.
- Continuity: When Wolf is walking in the sewer, one of the shot is reversed, notable by his whip and wrist blades being on the left side.
- Continuity: While indoors, the amount of water on the characters varies, switching from barely wet to soaked and back during the same scene.
- Continuity: Before the helicopter lifts off, Kelly kills an alien by shooting through the windshield. Later, when the helicopter is in flight and attempting to escape the nuclear blast, the bullets holes are gone.
- Continuity: In the first film it is clearly stated that it takes place on October 10th 2004. Aliens VS. Predator: Requiem takes place immediately after the first film. But in the maternity wards two vital signs monitors show within a matter of seconds show two different dates. These are June 3rd 2006 and September 23rd 2005.
- Continuity: Leading up to and including the final battle atop the hospital, all of the action takes place during a heavy downpour. Later the same morning at dawn, when the survivors are found by the soldiers, the entire area is completely dry. While this is possible, based on the amount of time the helicopter was airborne, it is not very likely.
- Revealing mistakes: When Jessie is impaled by the Predator's shurikens, she is seen being lifted before the blades actually hit her.
- Audio/visual unsynchronized: In the gun shop scene when Dallas approaches Kelly coming through the door with the pump action shotgun, the gun cocking sound is that of a handgun and not a shotgun being cocked.
- Factual errors: On Col. Stevens monitor displaying the bomber and delta force helicopter, the motifs used appear to be that of a Panavia Tornado (as opposed to the depicted F22 Raptor)and Westland Lynx (as opposed to the labeled Blackhawk). Both of these are European, despite being used on a display aboard a USAF E3 presumably built (and programmed) by US engineers.
- Factual errors: When the pred-alien youngs are seen bursting out, they are seen bursting out from the same spot where the human babies suppose to be. It is not possible as the human female reproductive organs are separated from the rest of the body organs. The pred-alien is seen implanting its young directly into the human female bodies. Those young couldn't have penetrated the reproductive organs without causing internal bleeding.
- Factual errors: On the screen showing the purported "damage assessment" of the tactical nuclear weapon, in the lower part of the screen the bomb is designated as a "MK 83". In actuality the Mark 83 is not a nuclear weapon, it is a conventional weapon with a modest amount of high explosive inside. It would not be capable of the damage estimated on the readout. The correct designation of the nuclear weapon is a "B 83".
- Factual errors: When the F-22 Raptor arrives over the town and releases the "nuke" it is traveling at near supersonic speeds (to allow it to escape the blast radius of the weapon). However the bomb is seen to "free fall" at a near vertical angle, and only deploys its retarding fins moments before detonating. In reality, when deploying a weapon with retarding fins attached, the fins spring open immediately after clearing the bomb bay to maximize the available time for the aircraft to clear the lethal radius of the weapon. Also, the B-83 nuclear weapon does not employ retarding fins to slow its descent, it uses a Kevlar parachute.
- Errors in geography: The Greyhound bus is seen arriving in Gunnison at the beginning of the film, with the destination sign in the front window marked CRESTED BUTTE. Although Crested Butte is 28 miles north of Gunnison on CO-135, there is no Greyhound transportation of any kind to Crested Butte. Additionally, Greyhound offers no services on their fleet of buses to Gunnison itself, as these are contracted out to another bus company, Black Hills Stage Lines, Inc.
- Errors in geography: Although some scenes of the film take place in the sewer system underneath Gunnison - no such system exists. The Gunnison sewer system is limited to piping, and does not include underground catwalks.
- Revealing mistakes: When the helicopter is riding the shock wave of the blast, the horizon indicator is shown spinning. This would only be possible if it were flying on a corkscrew trajectory, which it is not being shown as doing.
- Revealing mistakes: When Kelly comes home in her uniform. Her Flag patch and unit patch are reversed. The flag goes on the right shoulder, not the left. The unit patch goes on the left shoulder, not the right.
- Revealing mistakes: Kelly is wearing a US Marine Corps digital camouflage uniform with a US Army name tape.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Factual errors: SPOILER: Since Gunnison covers only 3 sq. mi., Colonel Stevens's map is showing a "pressure damage" radius of barely 1/4 mile. In reality a 200KT nuclear explosion would level all structures within at least one mile. The "heat damage" radius on Stevens's screen is even more understated.
- Continuity: SPOILER: Ricky gets stabbed through the shoulder by the pred-alien in the hospital but later shots show no blood or damage to his flak-jacket.
- Factual errors: SPOILER: Ricky gets stabbed through the shoulder by the pred-alien in the hospital and later uses his injured arm several times in a way that would be pretty much impossible after suffering such a major wound in that location, not just because of the incapacitating pain but because of the gaping hole he'd have where some of the necessary muscles would be.
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