The film was originally conceived as a live-action feature, but became an anime when several backers abruptly pulled out in pre-production.
The choreography from Mima's group CHAM are not in unison. This is intentional to keep the realism of the film.
The film is based on the 1991 novel, "Perfect Blue: Complete Metamorphosis" by Yoshikazu Takeuchi. The novel's sequel, "Perfect Blue: Awaken from a Dream" was released in 1995, two years before the film was released.
The film's original 35 mm camera negative was accidentally destroyed. As a result, all copies are sourced from lower-quality prints.
(at around 47 mins) The famous bath scene in Requiem for a Dream (2000) was directly inspired by the bath scene in this movie. Another example of director Darren Aronofsky using this film for inspiration.