Revealing mistake: When Brooke arrives at the camp to drop off Steph and Chrissy, Chrissy leans out of the car and vomits, but you can see that she's not really vomiting, and is using her hand to cover up the special effects tube.
Revealing mistake: Robin is running away from company investigators. He comes across a supposed wire link fence. He breaks it with his bare hands, and by the flapping of the open piece you can see it is made with strings not wire.
Factual error: Admiral Hadley often barks orders ordering Army forces to act, not just Navy forces. He wouldn't have the authority.
Visible crew/equipment: When the first car seen in the movie stops, the camera rig can be seen reflected in the hubcap.
Continuity mistake: Ari during the break from the party begins her seductive scheme; posing as a waitress at this guy's own engagement party, she approaches him while he is -for some reason - in the parking lot, makes him smoke a joint for the first time in front of his car, and kisses him - apparently all of this is super easy, barely an inconvenience. When she touches his face, she lowers her fingers from the chin at least 3 times in separate shots when she is whispering things to him. (00:11:50)
Revealing mistake: Not bad digital effects for a combination "Predator" and "Jurassic Park" monster movie, except that the dinosaurs don't cast shadows about half the time.
Factual error: When the protagonist is looking up the fingerprint (or fingertip...) data in the computer, he gets a match for a New York State Driver license. The document is a clear fake, with no document number (which in 2008 was on the front) and a 10 digits client ID number instead of 9 digits. (00:04:00)
Factual error: It was very nice of the East Anglian Transport Museum at Chappel and Wakes Colne to provide a train for the coder to go home in, and come in to work. The station is even in Suffolk; but of the two lines through the station, one is used by public trains, and the other by historic preserved trains. When the coder gets off her morning train, it is seen passing across points from the museum platform line into the railway museum, rather than continuing up the line to Sudbury, as a public train would. Appropriately, the train is a heritage DMU - a museum exhibit which has not been used on the main line for at least 25 years. So that's three reasons why she's not on a train which actually goes anywhere.
Factual error: Near the end, Zoe and Trey battle to the death, Zoe armed with a tomahawk and a knife, Trey armed with a Husqvarna chainsaw. During the battle, Zoe manages to amputate Trey's right hand, with which he was gripping the chainsaw's safety release and trigger (as his left hand gripped the support handle). Bellowing in pain, Trey continues swinging the chainsaw by its support handle with his left hand. Lo and behold, the chainsaw is somehow, miraculously, still revving in-and-out, which is only possible if the safety release is continuously depressed with the palm of the right hand as the fingers rhythmically flex to squeeze the trigger. Of course, with all major tendons in the wrist severed, an amputated hand cannot grip or flex or squeeze anything.