Revealing mistake: When Derek kicks the alien which has been cut in half, you can see the ground beneath the alien move making it obvious the lower part of the alien is buried in the ground. (01:03:30)
Audio problem: When Barry realizes he is out of bullets, he runs away. It cuts to the aliens running after him. You can see one of the aliens fire at him, but you can't hear any gunshot. (01:04:55)
Continuity mistake: When Frank nearly gets chopped by an axe-wielding alien, he grabs a knife lying near the chef (who is wearing a striped shirt) but when he finally gets the knife and swinging it upwards, the chef has now suddenly vanished. (01:05:45)
Continuity mistake: The slats in the rear window of Frank's car disappear and reappear. (01:07:40)
Visible crew/equipment: When the aliens chase the gang through the forest, the gang climb into the car. The aliens then shoot at the car, and then the gang drives away. As they drive forward onto the path, you can see a big pile of equipment, bags and other objects, and a camera set up across the road. (01:08:00)
Visible crew/equipment: When the aliens get into Frank's car, when the alien shuts the door you can see the reflection of a crewmember's legs, which are wearing red trousers. (01:10:40)
Continuity mistake: When the house is pulling the green sheet inwards, Frank is crawling away trying to get off it. In one shot he is crawling and there's planks and bits of wood scattered around and under him, but none in the next shot. (01:18:45)
Revealing mistake: After Derek lifts up the carpet in the blue van after running over an alien, he punches in a code on what looks like a code entry panel to grab the chainsaw. Upon closer inspection, he's actually entering the code into a calculator.
Revealing mistake: When Derek awakes on the rock, he obviously headbashes a gull made of wood. It is very fake, may be deliberate (This could be a "deliberate revealing."), but is a mistake nonetheless.
