- As early as when "A Scanner Darkly" was being filmed, comic fans had already selected the most suitable candidate to play the split-personality Acter . This person is Keanu Reeves .
- The two supporting actors Robert John Downey Jr. and Winona Reid both made a lot of noise in Hollywood due to negative events, but they both made a strong comeback in the film .
- Charlie Kaufman had previously adapted the novel into a movie script, but when the filming plan was transferred to Warner Independent for production, the script was abandoned .
- In the 1990s, TerryGilliam planned to make this novel into a cartoon, but ultimately did not complete the plan.
- Many of the descriptions of psychedelic sensations in the film come from the real feelings of Philip K. Dick himself after taking drugs .
- Since the film was eventually changed to animation mode, many equipment such as microphones appeared in the film during shooting, which required post-processing to delete. .
A Scanner Darkly behind the scenes gags
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Medical Deputy #2: Damage has taken place to the normally dominant left hemisphere, and the right hemisphere is attempting to compensate.
Fred: The two hemisphere in my brain... are competing?
Medical Deputy #2, Medical Deputy #1: [in unison] Yes.
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Medical Deputy #1: You know, Fred, if you keep your sense of humor like you do, you just might make it.
Fred: Make it? Make what? The team? The chick? Make good? Make do? Make out? Make sense? Make money? Make time? Define your terms. The Latin for 'make' is facere, which always reminds me of fuckere, which is Latin for 'to fuck', and I have been getting jack shit in that department as of late.