Continuity mistake: At the beginning, when the NASA spacecraft lands on the MAC planet, there are three silver antenne around the side of the craft which are absent in some shots. (00:02:15)
Continuity mistake: When the MACs' are sucked into the NASA spacecraft, an explosion occurs, causing a grey cylinder capsule to fly off. In the next shot the capsule is attached to the craft again. (00:04:25)
Continuity mistake: In the panning shot of the NASA lab, the clock's minute hand can be seen on the half hour mark, yet in the close-up of the Professor, the time reads eight twenty. (00:06:50)
Visible crew/equipment: When the MAC's emerge from the NASA craft in the lab, there a shot through the lab glass of the father MAC, with the reflection of a cameraman holding a camera in the glass. (00:08:55)
Continuity mistake: After the father MAC smashes the panel of glass at the science lab, there is more glass missing in the second shot, although no further breakage is heard nor seen. (00:09:10)
Revealing mistake: MAC is grabbing the electric fence, being blown backward by the helicopter. When he releases his grip, wires can be seen attached to his hands. (00:10:35)
Continuity mistake: When MAC is blown by the helicopter, he lands on a man's windshield, and the man has to start dodging traffic. Between shots the traffic he is dodging changes. (00:10:45)
Revealing mistake: When the man's car swerves out of control after MAC lands on his windshield, a pile-up occurs. In this scene, it can be seen that the drivers are either absent, or dummies. (00:11:00)
Revealing mistake: In the pile up scene, due to MAC covering up a man's windshield, a huge truck swerves and flies over a car, only the big black ramp used for the stunt is rather visible. (00:11:00)
Continuity mistake: When Eric is playing with his remote control car, he stops and takes the battery out. In the next shot, when MAC touches the car, the car is now in a different position. (00:20:00)
Continuity mistake: After the delivery guy puts Eric's TV down, it changes position in the following shot, and so do the cables on top of it. (00:20:30)
Continuity mistake: When Eric wheels himself outside in his wheelchair, to follow the footprints, as he exits the double doors, he goes down a ramp. Later, when his brother walks through the doors, the ramp has vanished. (00:23:10 - 00:24:10)
Continuity mistake: When Eric following the wet footprints outside, to the edge of the lawn, the footprints change in appearance drastically, between shots. (00:23:15)
Continuity mistake: When Eric first talks to Debbie, as she stands on the balcony, the position of the bracelets on Debbie's right wrist keeps changing. (00:23:35)
Continuity mistake: When we see the two holes drilled through the wall, by MAC, there is nothing above the holes being made, yet in all the following shots a large painting is above the holes. (00:29:10)
Audio problem: When Eric's wheelchair goes out of control, and he starts to roll down the hill, Debbie cries out "Eric" but her mouth doesn't move. (00:32:35)
Revealing mistake: After Debbie and Eric have captured MAC in the vacuum, it goes out of control, causing Debbie to get flung around the room. The track that goes up the wall, across the ceiling, down the other wall and across the floor is visible for this stunt. (00:42:20)
Continuity mistake: When Eric and Mike find the newspaper clippings and papers left on the table by MAC, to try and tell them about where he came from, the papers' positions change between shots. (00:47:35)
Continuity mistake: When Debbie's mum stops the car, as MAC speeds past them on a remote control car, she parks on the right side of the road. In the next shot her car is on the left, then back on the right. (00:51:00)
Revealing mistake: When Mac is escaping down the hill in the yellow toy car, the image is reversed - the "KC" lights are mirrored. (00:51:00)
