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".
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 will be re-releasing the original edit September 2007.
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.