The first use of computer digitized images as part of a feature film (not merely monitor graphics) was the Gunslinger's point of view in Westworld. After the process was finally developed enough to produce satisfactory results, it took a mere eight hours to produce each ten seconds of footage for the Gunslinger's pixelated POV.
Yul Brynner was suffering from financial difficulties by the early 1970s and in desperate need of money. With no other movie work on offer to him at the time he reluctantly agreed to play his role for a knockdown $75,000 which comes out to $485,648.65 in 2022.
The robot that Yul Brynner portrays is an homage/spoof of his character Chris from The Magnificent Seven (1960) and wears the same costume.
Both Richard Benjamin and James Brolin were cast less than 48 hours before filming was due to begin.
Michael Crichton became inspired to write this film after a trip to Disneyland, where he saw the Pirates of the Caribbean ride, and was impressed by the animatronic characters. Furthermore, the ride is mentioned in Jurassic Park (1993), when Malcolm says "When the Pirates of the Caribbean breaks down, the pirates don't eat the tourists," unlike what happens in this film. Jurassic Park was based on the novel by Westworld writer and director Michael Crichton.
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