Kiriyama, the film's main villain, does not utter one word throughout the entire film. He does, however, make a noise through a megaphone at one point.
The magazine containing bomb-making instructions that is used by Shinji Mimura and his gang is titled "Hara Hara Tokei" ("The Ticking Clock"). This magazine is a real bomb-making magazine published by an anti-Japanese-Government activist group called Higashi Ajia Hannichi Buso Sensen (East Asia Anti-Japanese Armed Front) from the 1970s.
Ai Iwamura, the actress who played Mai, the smiling winner, only appears for about five seconds as her character. She was then asked to do some stand-ins for some of the girls in the class briefing scene. In that scene, she appeared as following characters: Noriko Nakagawa, Haruka Tanizawa, Hirono Shimizu, and Izumi Kanai. The total time of her appearances as a stand-in exceeds the time of her appearances as her actual character.
The movie was shot in different locations all over Japan. The one location that was actually a small island was Hachijô-Kojima, an uninhabited island in the Izu chain hundreds of miles south of Tôkyô - it is used in many scenes where the students are seen by the seashore, as well as the shot of the island at the end.
Despite the belief that this film was banned in the United States, it is not the case. There are, however, several conflicting if plausible explanations as to why it hasn't been released there as of yet. The first is that Toei refuses to license the movie for North American distribution and has already rejected offers from several American companies. The second is that Toei's licensing fee is unusually high for this kind of film, so smaller independent distributors can't afford it and larger distributors that can afford it refuse to pay it. A third story was that no distributor was willing to pick the film up after the Columbine school shootings, due to the plot line of high school students killing each other.
Although this movie is filled with lots of shooting rampages, only two cast members in two scenes were shot using squibs (small fake blood packs to simulate bullet piercing): Takayo Mimura, who played Kayoko Kotohiki, and Takeshi Kitano, who played Kitano-sensei.
Many members of the Japanese Parliament tried to get the novel banned, but to no avail. When the film was released, they attempted to ban it also. Both efforts resulted in the novel and film becoming even more successful as people bought the book and went to the movie to see what the fuss was all about.
Director Kinji Fukasaku has said that he based this movie on his experiences in World War II Japan, where he worked in a factory that was regularly bombed by Allied aircraft and many of his fellow workers were killed on their first or second day on the job and he never got to know any of them.
The film began its first general North American theatrical run at the Silent Movie Theater in Los Angeles, CA, on December 24, 2011, 11 years after its Japanese theatrical release.
Mitsuko Souma (Girl #11), Satomi Noda (Girl #17), Yoshio Akamatsu (Boy #1), Toshinori Oda (Boy #4), Hiroki Sugimura (Boy #11), Yutaka Seto (Boy #12), and Shinji Mimura (Boy #19) are the only characters to have the same designated weapon in the novel, manga, and film of Battle Royale.