The rooftop chase climax was a combination of live-action shots of Harrison Ford combined with a matte painting.

Although for many years, Harrison Ford refused to talk about the film, he did contribute to the 2007 DVD documentary Dangerous Days: Making Blade Runner, claiming he has reconciled with Ridley Scott and made his peace with the film. In fact, Ford says the thing he remembers most is not the grueling shoot or the arguments with his director, but being forced to record the voiceover which executive producers Jerry Perenchio and Bud Yorkin insisted be in the film. Ford doesn’t actually mention any names, but in discussing the voiceover which was used in the theatrical cut, he says it was written by “clowns”. In actual fact, Darryl Ponicsan was initially hired to write it, but his version was tossed out. Then Roland Kibbee was hired and his version is the one that was used. According to David Peoples and Hampton Fancher, who had become close friends, when they first saw the film, they each thought the other had written it, and despite the fact that they both hated it, they told one another they loved it for fear of insulting the other’s feelings.

Director Ridley Scott and actor Harrison Ford had disagreements about the script almost from the very start. Ford hated the voiceover which Scott was proposing and he was against the idea that Deckard may be a replicant, feeling it undercut the human story of Deckard discovering his lost humanity (Rutger Hauer agreed completely with Ford on this point). According to Ford, Ridley Scott and he agreed prior to shooting that Deckard was not a replicant, but then Scott went and shot it to imply he could be, which disappointed both Ford and Hauer.