Factual error: The actual Tsavo lions responsible for the killings had no manes - see for yourself; they are on display at the Field Museum in Chicago. [The filmmakers employed artistic license in using maned lions. They were also certain to include - at the very end of the movie - footage of the real Tsavo man eaters, as they appear in the Field Museum.]
Continuity mistake: In the scene where the Graboid is pulling the truck you can see that there is a gun rack and a gun in it. Right before they are about to hit the rock you can see that the gun falls off of the gun rack. The gun goes on and off the rack between the following shots. (00:30:25)
Continuity mistake: The white cloth that Sarah presses against her cut and bleeding wrists never appears to have blood on it in any of the shots.
Other mistake: Just as the gang are off to pick the plants they need Faith goes off to talk to Daniel. While she's there the others woop and laugh, but they do it once and it's recorded. It's played 3 more times, straight after each other. Sounds slightly stupid.
Continuity mistake: The terrorist blow up many Jeeps when they ambush the military in the opening scenes. The problem is, they blow up more Jeeps than are in the convoy. When the terrorists steal the truck that was being escorted by the military convoy, we can see there were 3 Jeeps. But during the ambush scene, there are a lot more than that blown up by terrorists using weapons.
Continuity mistake: At the very end there is a shot of (Dennis Miller) opening the door of a car for the lady, then cuts to the inside of the car, where her door is slammed shut, obviously by Dennis Miller, and approximately half a second after her door is shut, the passenger door opens and Dennis gets in the car. He must be able to leap over cars in a single bound.
Revealing mistake: When Le Merchant is offended by his wife's comments and puts the Lament Box into the travel chest, a section of the gold veneer on it has bent upwards.
Plot hole: When Peyton/Darkman is showing Bridget how the liquid skin works, he drips a small amount onto his burnt finger, and it solidifies. However, when he drops it onto his finger, it magically shapes itself into a replica of a perfect, undamaged finger. This makes no sense, as it is simply a liquid and is not being molded by any forces. Hence, it should not look like a perfect finger.
Continuity mistake: Before Halleck eats the cursed pie, a fork appears next to the pie between shots.
Factual error: The geography throughout the film is all wrong. The setting is in Pennsylvania, near Pittsburgh. The driving times between there and Williamsport are extremely under-estimated. Most egregious is the river structure. The body is found in the river near Sunbury. Not possible from a site in Western PA. Basically all relationships between actual towns/cities mentioned are totally wrong.