Batty: It's not an easy thing to meet your maker.
Tyrell: What could he do for you?
Batty: Can the maker repair what he makes?
Whenever Deckard occupies his room there is a low/high hum if you listen very carefully! This sound is very like or if not the very same low hum that can be heard on the Nostromo in the first Alien movie (1979). See more...
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Audio problem: Deckard (Harrison Ford) investigates the maker of artificial reptiles; an Abdul somebody. It's obvious that the dialogue was added as neither actor is in sync with the sound. The end of the scene has the storekeepers voice telling Deckard the information he was seeking while Deckard's mouth is the one moving. Deckard's mouth continues to move even after Abdul's lines are finished and the scene cuts. This has been corrected in the 2007 Final Cut of the film, but exists in all previous versions.
Other: 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!
Audio problem: In one of the scenes at J.F.'s house, J.F. is talking to Batty and Pris. Batty is sitting down and starts talking about J.F.'s chess game. Batty says "your opponent" then J.F. says "Oh, Dr Tyrell." While he says this the chess game is shown, then it cuts to Batty and J. F. and he continues "I've only beaten him once at chess." For this line his lips are not moving.
Continuity: 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.
Continuity: When Deckard is snooping about in Thora's dressing room asking questions. We see her putting on high heel mid-calf boots (just under her shin pads). Watch the chase sequence soon after. Especially when she gets shot and is on the ground picking herself up, you can see she is wearing what looks like black trainers.
Visible crew/equipment: There are at least two rain related problems in the city exterior shots: it's noticeably misaligned when Rick and Gaff are outside Leon's apartment building (towards the right it falls straight down, yet towards the left it falls at an angle). The second is when Gaff encounters Rick and the now dead Baty on the hotel roof; despite previous shots showing no awning or any type of cover above said roof, Gaff is visibly dry and actually standing in front of the rainfall, only getting wet when he steps into the background.