Trivia: In the scene where Ford and the other policeman take off in a police car, there is a shot of the inside of the car showing a computer screen with a flashing word "purge" on it. The screen was originally used in "Alien" when Ripley set off the shuttle to escape from Nostromo. (00:10:30)
Trivia: In the scene where Daryl Hannah is startled by William Sanderson outside his home, she runs away toward his parked van and breaks a door window when she collides with it. If you look carefully you can see her slip off the wet curb at the same time. This was a real accident and Daryl Hannah continued with the scene because no one realized it at the time and Ridley Scott didn't yell,"Cut". (00:38:38)
Trivia: The entire ending of the film, and other parts of the film was altered at the last minute. The test preview did not get the reaction the head of the studio paying for the film wanted. The audience just didn't get what Ridley Scott was calling "The dark side of comic strip" so they took control, and collaborating with Ridley Scott changed it to what it is today. 25 years on Ridley Scott re-released the original ending in September 2007.
Trivia: The chess game between Tyrell and Sebastian uses the conclusion of a game played between Anderssen and Kieseritzky, in London in 1851. It is considered one of the most brilliant games ever played, and is universally known as "The Immortal Game". (01:21:15)
Trivia: In the final scenes in the first move version (before the Director's Cut) Deckard and Rachael fly over a landscape. Ridley Scott had run out of funds and time when bad weather had ruined the shooting of the landscape, no possibility to get new shots. The scenes thus used were outtakes from intro scenes of The Shining. These shots were removed in the Director's Cut.
Trivia: Just after Rachel asks Deckard that if she goes north, would he hunt her, he says no and then walks behind her. He is out of focus during this next part, but pay close attention as he says "but somebody would." His eyes can be seen glowing like the other replicants in that light, which is one of the clues people say leads them to believe he is also a replicant. (01:06:40)
Trivia: Daryl Hannah is a skilled gymnast (check out the casual ease with which she does a backflip while talking to Sebastian) and under normal conditions was perfectly capable of performing the rapid flips seen during her fight scene with Deckard, but by then she was too sore and exhausted to pull them off perfectly. This is partly why they resorted to using a male stunt double in this scene, he was the only one immediately available who could do those flips exactly as needed.
Trivia: Harrison Ford has said that director Ridley Scott used "psychological manipulation" on Sean Young. While he refused to get specific, some of Young's complaints that the cast and crew (Ford especially) seemed to hate her for no apparent reason echo Sigourney Weaver's experience on Alien, in which Ridley Scott instructed the other cast members to act rude to her in order to affect her performance. Young has said she felt her treatment on set was tantamount to abuse and hated working on the film.