Trivia: In the film, the two transfer students are Kiriyama, the silent killer, and Kawada, the winner of a previous Battle Royale. In the original novel, only Kawada was the transfer student; Kiriyama was in the same class selected for this game of death. He was the main antagonist.
Trivia: In the bungalow, two female students, Hirono and Mitsuko, are having a beef. Hirono taunts Mitsuko, who loses patience and cries out, 'I've had it! Why does everyone gang up on me, what did I do!' In a website dedicated to the film, it states background information [most likely from the manga] that Mitsuko is the 'class slut', hence Hirono's accusations of Mitsuko stealing her boyfriend, among others, is justified.
Trivia: The Japanese DVD features outtakes from the film. One of these shows that in one scene where a cooking pot is thrown at a girl, the pot actually did hit the actress and hurt her (although not badly). The shot where this happened does appear in the movie, but any sign of her having been hurt was edited out.