Revealing mistake: When Shuya impales a commando with a pipe, the strap holding the pipe in place is visible, when he turns towards the camera.
Battle Royale II: Requiem (2003)
1 revealing mistake
Directed by: Kinji Fukasaku, Kenta Fukasaku
Starring: Tatsuya Fujiwara, Ayana Sakai, Ai Maeda, Shugo Oshinari
Deliberate mistake: When the teacher walks over the floor towards the blackboard, he walks through a lot of blood. However when it cuts, he leaves no traces of blood where he steps.
Shiori Kitano: The thing people fear most isn't dying, it's being forgotten.