Continuity mistake: Out in the desert, just before MAC points out the sign, everybody sees horses. In a wide shot both the horses and sign aren't there.
Visible crew/equipment: When the FBI guys decide to follow the car to the McDonalds, the camera is visible in the side as they pull away.
Revealing mistake: When Eric fails into the water, you see MAC sit up into the shot. This was obviously done by rear projection, with MAC inserted into the shot. Notice the difference in contrast between MAC and the other shot in front of it.
Visible crew/equipment: When Eric falls off the cliff, the little girl comes to the rock and calls for help. The camera operator's shadow is visible next to her in the overhead shot.
Revealing mistake: When MAC is stuck to the windshield at the beginning, in one shot it appears he is just a sticker.
Continuity mistake: When the kids dance in the parking lot, they swap positions 180ยบ just as the family car arrives.
Continuity mistake: When Mac is dancing on the counter, disguised as a bear, he is twice as tall as he is for the rest of the film.
Continuity mistake: Mac jumps into the water feet first to save Eric, but when the angle cuts he is diving head first.
Continuity mistake: Before the wheelchair wipes out, while Eric is zooming down the hill, his hair is alternately still or moving wildly depending on the shot.
Revealing mistake: When Mac exits the vacuum cleaner, he is supposed to drink soda from a straw, but no liquid is seen going through it.
Continuity mistake: The cops chase Mac down a hill and then follow Eric and Mac through a private garden. Cut to a close-up of the cops and they're back on the hill.
Revealing mistake: When Eric exits McDonald's, Mac's eyes are two big bulky motionless balls, revealing it's been changed for a puppet.
Continuity mistake: After the McDonald's scene, the cops chase Mac and are about to be run over by a white car. A frame later the car has turned to blue colour.
Continuity mistake: In McDonald's, when Mac is about to grab the cup, in the close-ups his eyes are white, big like a ping pong ball, and occupy the whole cut-out space in the disguise. In the wide angles, the eyes are smaller and big bags underneath show.
Continuity mistake: When Eric gets out of the water, his hairstyle swaps from parted to sideways.
Continuity mistake: When the family arrives at their new home, a mover employee is walking forward holding a blanket. When the angle changes he keeps walking but empty handed, blanket now on the floor, 5 meters ahead.
Revealing mistake: When Mac dances with Debbie at McDonald's, disguised as a bear, he turns his head backwards and his neck is visible, revealing a human coloured skin.
Continuity mistake: In the van, when Mac is watching the road, Eric disappears from the seat.
Continuity mistake: After the wheelchair scene, while the cops attend the family, a group of kids pass by the house. When the angle changes they've moved several meters back and pass by again.
Visible crew/equipment: When Eric's brother says that the traffic jam was caused by a drunken alien, the shadow of the moving camera is visible on the outside of the van.
