- Keep Circulating the Tapes: The film's original 35mm camera negative was accidentally destroyed at some point, so all copies of the film are sourced from lower-quality prints.
- Late Export for You: The original novel was released in 1991, and the sequel in 1995, two years before the animated film was released in Japan. The film was released internationally in 1999, and almost 20 years later, Seven Seas Entertainment has announced that the novels will finally be coming to western shores, with the first novel released in January 2018.
- Unintentional Period Piece: Mima is a twenty-one-year-old who doesn't know how to use a computer. This was plausible in 1997, when the film came out, but the very concept is unthinkable twenty years on.
- Alternatively you could take it as an indicator that Mima isn't Mima at all, but Rumi, her middle-aged manager...
- What Could Have Been: A series was planned but never materialized.
- Think the anime is a lot like Black Swan? You're not the only one: Director Darren Aronofsky bought the copyright to Blue initially in order to use it in Requiem for a Dream. Him and Satoshi Kon actually became friends over this.
Trivia / Perfect Blue