Continuity mistake: While this movie is so bad and full of mistakes, its barely worth finding them all, one stands out in the history of movie mistakes. One of the officers on board the ship, Lt. Lamont, is killed by the villain. A few scenes later she shows up on the bridge as an extra.
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)
Visible crew/equipment: When Nada is escaping with Holly, you can see the reflection of the film crew on the car. (00:44:15)
Visible crew/equipment: When Johnny is spinning the two robbers around, you can tell that he is actually holding dummies. In the close up shots of the robbers, you can see them kicking their legs, but in the wide shots of the room, they are rigid and lifeless.
Continuity mistake: At the end when Michael Jackson is singing come together, at the end of the song his shirt is undone, but when the camera shoots back on him his shirt isn't ripped.
Continuity mistake: When Kaneda shoots Tetsuo with his laser gun, it makes a hole on his shirt. In the next scenes, the hole is gone.
Revealing mistake: As Reg fights with one of the baddies with the chainsaws, as the baddie take a swing with the chainsaw he misses and cuts into the wooden door. You can clearly see that a vertical cut has already been made in the wood though, to help the chainsaw get in and cut. (01:17:55)
Visible crew/equipment: When Joey smashes the garage door open by reversing the car into it, you can see fluorescent lighting reflected in the car windows. The garage does not have fluorescent lighting fitted inside it.
Other mistake: As the brown truck drives away in the scene after the man working in the newspaper office is "harpooned" by a Critter, if you look closely as the truck turns a corner you can see some Critters rolling after it. Well, after they roll past the truck in the bottom left of the screen you can see the Critters roll right smack into another parked car. Obviously the crew forgot to add a turning feature to their Critter balls (which were just some fur taped to a basket ball).
Visible crew/equipment: As Zeebo is kissing Tanya, the device used to make his ears wiggle is briefly visible.
Continuity mistake: When Celeste explains to the Elders why Earth should be saved she says, "They have sneezes", but doesn't explain what they are. The Elders don't look like they recognize the term. Later, one of the Elders sneezes, and says, "We don't have sneezes here." Now how could he know that he just sneezed, if nobody explained it to him?
Visible crew/equipment: In the bathroom, when Mike's ex-girlfriend is getting undressed to take a shower a long-necked clown jumps from out of the toilet. Anyone, and I mean anyone, can clearly see the arm of a white guy sticking out of the bottom of the clown's neck controlling the puppet.
Continuity mistake: Sergeant Parker is thrown through the air with his boots on, yet we are shown the dead hobgoblins beside his smoldering boots.
Revealing mistake: In the last scene of the film where the Reverend is holding up the glass jar with the mini-blob in it, you can see the mechanism being used to move the blob (look between the Reverend's fingers). (01:30:30)
Visible crew/equipment: Near the end when Wilford and Don and Kitty are about to sneak into the Oceanic Center, they are scoping out the scene. As they turn the corner, the shot changes to a shot mounted on the hood looking right at Wilford. You can make out the top of the camera's shadow near the right windshield wiper. (01:30:45)
Continuity mistake: When Igor grabs Tara and pulls her inside the truck, Tara drops the tomato twice between the shots. (00:54:40)
Continuity mistake: Wanda wears glasses at first, even acting like the type of person who'd be half blind without them. Yet once she loses them she sees perfectly.
Continuity mistake: When the condo manager shows up at Billy's house to take Purple, and chases him round the garage, some stuff, including a white plastic basket, falls off a shelf twice; first in the wide shot, then again in a closeup of Purple's feet.