Other mistake: Just before Leon's questioning starts, Holden turns on the VK and the eye monitor censor piece flips out. There is a view from Holden's perspective showing Leon's eye in on the screen, meaning the eye piece has already zoomed in on Leon's eye. Then just after Leon says "Care if I talk?" it cuts to a side angle as he says "I'm kind of nervous when I take tests." This view shows Leon is looking towards the wall at a 90 degree angle away from the VK, meaning the view screen and eye piece could not have been seeing his eye at a frontal view as show in the previous shot. (00:05:15)
Continuity mistake: When we first see Deckard he is sitting down and reading a newspaper. After a little bit of time a seat becomes available at the restaurant across the way. The cook calls him over. Deckard then folds the newspaper once and places it over his head to shield himself from the rain. We see him run across the thoroughfare and off camera. It then cuts to him making his last couple steps to the waiting seat and the newspaper is now folded twice. (00:09:00)
Continuity mistake: After he finds dead Pris, the blood smears on Roy Batty's lips change. He touches her bloody wound with the fingertips of his right hand and then presses them to his upper lip. You will see two parallel smears of blood. Moments later there is only one smear going from his upper lip all the way to his chin. (01:37:20)
Other mistake: When Deckard is waiting for a seat at the Chinese restaurant, he is reading a newspaper, presumably the day's edition. On it, the main headline reads, "FARMING THE C...MOON AND...WORLD..." Later in the movie, when Deckard is investigating Leon's room at the Yukon, he searches a drawer lined with a newspaper page, all crumpled and having presumably been there for quite a while, stained with some fluorescent oil or such, but he briefly flips it over and it has the exact same headline.
Other mistake: When Deckard and Bryant are viewing the interview tape showing Leon's interview at the Tyrell Corp they are shown Leon's replicant statistics. The tape shows Leon's model number: N6MAC41717. This designates Leon as a: Nexus 6, Male, Physical Level: A, Mental Level: B, and an incept date of: April 17, 2017. The incept date shown under his model number is: 10 April, 2017. As Deckard and Bryant continue to watch the tape they see the other replicants: Roy, Zhora and Pris with their individual statistics showing a matching model number to their incept dates. (00:14:50)
Continuity mistake: Just after Rachel asks Deckard if he ever took the VK test himself, she walks in after no response and sees that he has fallen asleep. Before the camera shows him sleeping, she is shown walking into the room, clutching a drinking glass with both hands in front of her. The camera switches to Deckard for a couple seconds, then back to Rachel. She is standing in the same spot, with no immediate area to set the glass down at, but her pose has completely changes where she has one hand on one hip, and the other arm limp at her side. At which point she then reaches forward with her left hand to grab a picture off the piano, and the drinking glass has vanished. (01:07:50)
Revealing mistake: When Deckard has the dream of a unicorn, it races towards the camera and you can see its horn. The horn is wobbly, revealing it's just stuck to a regular horse. [Note: this has been cleaned up for the Final Cut release, but can still be seen in earlier versions of the film.] (00:42:45)
Continuity mistake: After Pris and J.F. Sebastian startle each other, they begin to talk for a moment. Watch J.F.'s hands as he says "Don't worry, I won't hurt ya." In the side angle, his left hand is hidden and his right hand is fidgeting with the bag he is holding at his chest. It then cuts to a view from over Pris' shoulder and suddenly his right hand is now hidden from view and it's his left hand fidgeting. (00:39:00)
Continuity mistake: After Leon puts his hand in the freezing liquid holding the eyes, warranting several angered scolds from Chew, Chew looks at Roy in puzzlement. Between this shot and the shot after Roy says "Yes... Questions." The head gear on Chew's head moves up on his hat. The position of it changes several times during this scene. (00:28:40)
Continuity mistake: After Gaf takes Deckard to his police car to go see Captain Bryant, he looks at a screen that is blue, then turns red and says PURGE. He looks down and to his right when he sees this. Moments later as they are flying in the vehicle, a view from the back seat shows the front dash with two screens. The one in the center, which would have been the one he was looking at since he was looking down to the right, is now much skinnier than it was moments before. It's the one showing green and orange text now. (00:10:25 - 00:11:10)
Continuity mistake: When about to question Leon, Holden asks him "Please don't move." When he does, his right arm is up and he points at Leon for a moment. It then cuts to a close up of the VK and suddenly his right arm is down in front working on the VK. The folding black flap things on the VK are also suddenly up and moving where they were not in the previous shot. (00:05:20)
Other mistake: The snake scale changes size and shape each time it's seen, it begins as a large hexagonal shape bigger than Deckard's finger tip when he first finds it, it's later seen as a very small triangular shape in the sample bag and it ends up as a guitar plectrum shaped object when he hands it to the street merchant for identification.
Continuity mistake: The scene where Roy saves Deckard's life and then dies takes place on a very dark and rainy night. After Roy says his final line, "time to die", the white dove in his hand gets loose and flies away. The next shot shows the bird flying in a totally clear cloudless sky, with lighting that suggests that it is becoming morning. The next shot is of Deckard, back in the heavy rain and total darkness. (01:47:20)