Continuity: Escaping from the cops, Eric's on the road, dodging cars. A blue one smashes the back of a car and breaks its own fender and lights; but the damage is already done before the crash.

Continuity: When all the guys go with Mac to find his family in the mine, the collar on Mac's t-shirt keeps changing from very loose, to slightly loose, to really tight around the neck between shots.

Continuity: When the paperboy throws the newspaper on the runway the van disappears.

Continuity: Eric is about to arrive to the place where his mum works, and there's a close-up of the cop's car chasing him. A big line of cars is seen behind him, but in the wide angle not only the cars are gone, but the real traffic is running in a perpendicular road to the one he's in.

Continuity: When Mac's in the desert calling his family, an aerial view shows Mike away from the car following him. In the following close shot he's next to the van's hood.

Continuity: The chip on the cop's windshield disappears when they arrive at the mall.

Continuity: Rearview mirror appears and disappears from the cops' car when they're going to McDonald's.

Continuity: When Mac dances on the McDonald's counter, the cash registers are gone.

Continuity: Rearview mirror appears and disappears randomly from the car Eric's in, when going to McDonald's.

Continuity: Mac stretches his hand and grabs the cup of Coke, which is tilted sideways. In the following angle it's straight.

Continuity: Mike is unpacking his things and puts on his glasses. He stares at the door in awe because he sees Mac standing, but the reflection of the glass shows that there's no one there.

Audio problem: Eric escapes from the cops in McDonald's and he says, "Well done, Mac" but his lips are saying something else.

Continuity: In McDonald's, Eric holds Mac by the neck, in the next shot he holds him under the armpit, without having had time to make the movement.

Continuity: When escaping from the cops, while holding onto the truck and zooming down the road, Mac is on Eric's lap, bare chested and with a couple of rags on his lap. Then Eric throws away the rags, but in the next shot Mac is covered in clothes that have appeared from nowhere.

Continuity: When the neighbour and her mum are in the car waiting for Eric to come out of the house, one of the cops behind turns his head and stares at the car, but in the immediate wide angle his head is in a different position.

Continuity: The position of the rags that Eric throws on the road, when escaping from the cops, differs between shots.

Continuity: When the aliens throw the pyramid of cans, some signs also fall on the floor, yet they disappear in the wide angle.

Plot hole: The Alien family finds itself surrounded by armed cops, scientists, and helicopters yet the next time we see them, some seconds later, is walking around some deserted area. If the Government set them free there's no point in the chase of Mac. On the other hand, if the family managed to escape, then the scene with them defenseless in the supermarket is absurd. No explanation whatsoever is given to this really important part of the movie.

Continuity: Eric follows Mac's footsteps and opens the fridge. A bunch of glasses fall on him, none inside the fridge, but when he closes the door there's one in the fridge.

Continuity: When Eric is playing with the remote control car, there's a toy plane to his left, which keeps changing to a yellow truck and back to a plane all the time.