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.
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.
Continuity mistake: The dialogue between Holden and Leon in the beginning never matches the interrogation tapes during the films (excluding Deckard's recall a moment before he confronts Pris). Most notable are the time and speaking manner. It can be heard when Deckard and Bryant listen to the tape.
Continuity mistake: While waiting in the rain for his food, the chef across the street calls Deckard to come over. Deckard folds his newspaper and puts it over his head to shield himself from the rain. The paper is folded messily and the crease side is in his hand. When he gets to the other side of the street, the fold is suddenly much cleaner and neat, and the crease side is on the outside, no longer in his hand.
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.
Continuity mistake: The Asian chef calls Deckard over to order his food once a seat becomes available. There is a guy in a yellow shirt sitting next to the open seat. A blue bottle of some sorts is right next to this guy's arm. When Deckard comes over, the blue bottle has vanished. It appears again once Deckard sits down to his left by the yellow guy's arm. And then after the chef gives Deckard his food, the blue bottle is suddenly on Deckard's right.
Revealing mistake: Near the beginning of the film when Deckard and the other cop take off in the car to go to the police station, you can see the cables lifting the car up into the air.
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.
Audio problem: There is a part in the original version's audio that was changed for the Director's Cut. When Bryant tells Deckard that there are "5 Skin-jobs" walking the streets. It was changed to "4 skin-jobs." However, the change can be heard, the sound of Bryant's voice is noticeably different in the new dubbed line than in any other point during him speaking. The change is jarring and very noticeable. It almost sounds like a totally different person saying the line. This has been fixed in the final cut but exists in all other versions.
Other mistake: Bryant mentions that 'six skin jobs' escaped and that one got fried trying to get into the Tyrell building. Four of them die in the movie, so what happened to the last one? [In the "Director's Cut" and "Final Cut" versions the math has been fixed. Bryant now says that two of the replicants got fried, not one.]
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.
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!
Continuity mistake: As Deckard is setting up the VK to test Rachel, one shot shows him adjusting the eye piece with his thumb as she asks if she can smoke. The view from behind his hand shows his thumb up towards the top of the eye piece. But then the film cuts to a view of the other side and Deckard's thumb is now towards the middle of the eye piece.
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.
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.
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.]
Continuity mistake: When Deckard makes a hardcopy of the picture on the screen, it doesn't match the screen picture. The screen shot is a profile of Zhora; the hardcopy is a frontal view.
Other mistake: When the woman puts the snake scale under the microscope she doesn't take it out of the bag. She turns on a monitor to view the image; the image when shown is on a different monitor (you can tell by the controls to the right of the image). The image is not a snake scale, it is a marijuana leaf from the Sharf book (his book is in the ending credits).