Revealing mistake: When the Enterprise is leaving space dock, look at the right (starboard) side of the ship. You can see the shape of the mounting arm the model was mounted on, even though it was blacked out to look like space, and it also blocked out the bottom of the dock. The footage was reused from Star Trek: The Motion Picture.Movie Nut
Other mistake: When Deckard visits the Tyrell Corporation, he prepares to test Rachel with the "VK" machine. He is shown putting his briefcase of the table and lifting the "VK" machine out and onto the table. If you look closely, the "VK" machine is already on the table and Harrison Ford is miming the lifting - there is nothing in his hands! (00:19:45)
Continuity mistake: As Gant is pulling the Firefox out of the hangar, it is still very dark, as in pre-dawn. But as the Russian officers are shown shooting and watching the Firefox take off, it is suddenly much lighter outside as if it is after dawn and the sun can even be seen. But it would have taken 30-60 minutes for the light level to change that much.
Continuity mistake: When the Jun hoard attack the Emirite village, Dar gets knocked unconscious and his dog starts to drag him away. After Maax arrives, the dog is shown dragging Dar away a second time. Two mistakes are apparent. The dog is pulling on the cloth of his left shoulder in this shot. First, when the dog is pulling, the dog stops to get a better grip on the clothing. When the dog lets go of the clothing, Dar keeps sliding even though the dog isn't pulling. Second, when they show the close-up of Dar, the dog is pulling on his right side, not the left. Then again on his left side and again on his right side. It switches a couple of times.
Visible crew/equipment: When Alan and Lora go to see Kevin Flynn at his game room they find him playing his videogame 'Space Paranoids'. After he finishes playing, he turns around to talk with Alan and Lora. As they are speaking you can see the microphone coming up from the bottom of the screen. It even hits Kevin Flynn in the hand.
Continuity mistake: When Trash shoots the bounty hunter with the grappling hook, he shoots it at his stomach. After he ties it to the bike and drives off dragging the bounty hunter, the hook is now in his back.
Plot hole: Frank Ochoa told miss Nicole that Paul killed 9 people in New York when in fact he killed 10. (00:47:00)
Revealing mistake: Chong arrives at the curbside of the airport. The guy pulls up in a yellow Datsun for him. The fender is already dented. Chong starts throwing the guy into the fender at the exact point of the dent - the fender must've gotten dented in an earlier take.
Character mistake: During the surgery, one of the surgeons says to give the patient 25 cc's of cyatril. Then one says make it 35 cc's. 35 cc's (or 35 mL) is a full large syringe. The other doctor uses what looks like a 3 mL syringe and it's only partly filled. It seems the surgeons wanted 0.35 cc's.Bishop73