Continuity mistake: A helicopter drops two harnesses down to Chuck Norris (Major McCoy) who is awaiting with an unconscious bad guy, and tethers the villain to the ropes dropped by the hovering copter. The black harness ropes are shown dangling from the chopper throughout. When McCoy radios to "pull us up" with the villain in view, the once visible ropes are nowhere to be seen. (01:41:40 - 01:42:05)
Character mistake: G. Peppard holds up a Walther P-38 pistol and calls it a Walther PPK.
Continuity mistake: When Gatou Vardebedian is holding Gus Cardinale at gunpoint, the gun keeps changing position between shots (under his throat, by his nose...) and she is holding it straight or turned sideways. (00:13:00)
Revealing mistake: At the start of the film, where West and Cain are re-animating dead soldiers, one of them tries to kill West. So, he shoots him in the head. It's obvious that West's gun doesn't fire, and the soldier just pretends like he's been shot.
Continuity mistake: Kari and Traci are both wearing sandals barefooted when they are caught toilet papering the house by Tom and Finn but when the four of them go for a walk on the beach minutes later, Kari is now wearing grey sneakers and Traci has black socks with her sandals.
Continuity mistake: When the zombie Barry falls on Jordan, he's played by an obvious stunt double who isn't wearing any zombie make-up.