R | | Crime, Drama, Horror
The pop group "Dezaato" receives different romanji spellings throughout the movie, probably on purpose. Even though it actually means "Dessert", it's also spelled "Dessart", "Dessret", and "Desert" in the movie.
I'm Charles Manson of the information age!
When the students jump to their death on the school roof, you can clearly see crew-members throwing buckets of fake blood at the window.
Two different R1 versions of the film exist, an R rated version and an unrated version. Not only can they be differentiated by the unrated version having a red stripe on the cover, but they have different pictures on the sides of the DVD cover (the unrated having a picture of Mitsuko). There are six additions to this version of the film.