The movie's main character Nishi is based on Robin Nishi, the man who wrote the underground cult comic on which Mind Game was based. Some elements of the story are said to be autobiographical.
The faces shown throughout the show, belong to the actual cast, all of them being very well known TV personalities.
Eirin (the Japanese film board) presented Mind Game with a 'General Audiences' rating, despite its sex and violence, because they felt it was a movie that deserved to be seen by as many people as possible.
On April Fools' 4/1/2018, Toonami on Adult Swim surprised everyone by airing this film in its original Japanese language with English subtitles.
Madhouse was so impressed with Mind Game that they helped promote it, even though they had nothing to do with the film.