Visible crew/equipment: In the scene where she drives the car (with the kidnapped woman in it) down the hill towards the breaker/electrical box, when she hops out at the very last second you can clearly see a person dressed all in black sitting in the driver's seat driving the car down the hill.
Other mistake: When Sil jumps through the hotel room wall, Pres fires two shots from his Glock and then gets in the elevator. In the elevator he drops the magazine and his Glock has the slide locked back showing the magazine is empty. The man is an acknowledged expert in special ops (Indeed, the fact that he changes magazines in the elevator demonstrates his preparedness. He wants to face Sil with every bullet he can, he doesn't want to be even two short.) He is going up against an extremely dangerous extraterrestrial life form that has already killed several people. There is absolutely no way he would be carrying a weapon that was not fully loaded.
Add timeGrumpy Scot
Factual error: At the end when the oil in the cavern is burning there is no sign of smoke. With a fire as large as it appears to be, everyone in there should be choking to death, yet they don't even seem the least bit bothered. Forest Whitaker should have also been roasting over the flames, yet he is unscathed.
Character mistake: As Sil leads the team into the hills, she has the woman she kidnapped in the passenger seat, but lying down and no one can see her. Ben Kingsley's character says on the radio "THEY are heading into the hills", but he should have said "She is heading into the hills", as the entire point of this is that none of the team can know that Sil has a captive.