- 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.
- Factual errors: When Kelly returns home from the military, she is wearing the USMC MCCUU, not the Army's ACU. The ACU's are what the National Guard is wearing later. Her unit patch and American flag patch are on the wrong shoulders. Unit patches are placed on the left shoulder and the American flag patch goes on the right shoulder. Also, the unit patch is of the 101st airborne "Screaming Eagles" based in Fort Campbell, Kentucky. The American flag patch should also be full color not the subdued version. The subdued patch is only used while in a combat zone.
- Factual errors: At the end of the movie when Col. Stevens takes the Predator pulse rifle to Ms. Yutani, the Army 4-star general is wearing branch insignia. Army generals do not wear branch insignia.
- 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.
- Factual errors: The type of bomb dropped by the F-22 does not match the current U.S. nuclear inventory. While the Mark-83 is a type of bomb design, it should have been the B-83 instead of Mk-83 as B-83 is the designation for the air dropped weapon based on the Mark-83 design. Secondly, the type of U.S. nuclear weapon designed for delivery by fighters is the B-61 series while the B-83 is designed for delivery by heavy bombers.
- Continuity: In the maternity ward sequence, two vital signs monitors are shown within a few seconds of one another. The first monitor reads June 3, 2006, the second September 23, 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.
>>> 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.
- Factual errors: SPOILER: The view from the bomb bay doors shows the plane already over Gunnison when it releases its nuke. At the speed and height the plane was traveling, the unguided bomb would have certainly missed the town center, and probably missed the town altogether.
- 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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