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)
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: In the big fight scene, Roddy Piper and Keith David are wrestling and struggling about and land so the black guy's pants are getting soaking wet. In the very next shot as the fight continues, his pants are dry. (00:58:55)
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.
Continuity mistake: When Reg and Mike break into the hardware store for tools, the items in the trolley keep on changing from shot to shot, and also change position too. (00:14:10)
Continuity mistake: When Valerie picks up Ted's LPs, the cover of one of his speakers is missing, but in the shot where Valerie is lying on the couch tossing them into the fire, both speakers have covers.
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?
Continuity mistake: Sergeant Parker is thrown through the air with his boots on, yet we are shown the dead hobgoblins beside his smoldering boots.
Continuity mistake: In Short Circuit (1986), Benjamin's last name is Jabituya. In this film, it seems to have become Jahrvi.
Continuity mistake: There's a scene at the beginning with an old man and a dog sitting on the porch. Not only does the dog go from looking right to left from shot to shot, but in one shot he actually gets up and almost completely leaves the frame, and in the next shot he's laying down again.
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: When Bernie tries to hang himself in his bedroom by jumping off some suitcases he ties the rope around his neck. In the close-up he puts the rope behind his right ear and in front of his left ear. In the long shot however the rope is behind his left ear. In the close-up it's in front of his left ear again.
Continuity mistake: When Brad gets to his grandma's house he is standing outside her window. He holds his bag in his left hand and switches it to his right. When it cuts, he switches again. (00:10:00)
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.
Continuity mistake: When poor George is about to be sucked down the drain by the blob, he is looking at his hand. When the blob attacks him, he's holding on to the sink with both hands.
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.