Battle Royale shows the rewriting of history books (Noriko is genuinely surprised that people had it better in the "feudal times"), publicly broadcast executions as entertainment, propaganda against the "evil imperialists", and even a Big Brother figure in the Great Dictator.
The Selection of which class is a part of the program is not randomThe class that is selected is always the one that is determined to be the one most likely to produce someone that shall grow up to be a potential threat to the regime. The BR program insures that almost all of these students are killed and that the "winner" is so traumatized by his ordeal and so marginalized by society that the odds of him ever accomplishing anything are zero.
There is a small group of schools, no more that a few dozen or so, that are offically exempt from the BR programmeThese schools are reserved for the childeren of the Greater Republic of East Asia's Ruling Elite.
The current Tokyo Governor Shintaro Ishihara might draw inspiration from the Battle Royale ProgramHe's declared his hatred for Otaku and Gay people, but this article makes me think he would implement the program if he could.
If The Hunger Games film is successful, then the film Battle Royale will be exported as a Hollywood FilmThe only difference between The Hunger Games and Battle Royale is that in The Hunger Games the tributes aren't high school students, and they exposit more on the setting. The movie for Hunger Games might be given advertisements as if it was a Hollywood film. If successful, someone would notice Battle Royale and decide to export it as well.
The cat killed by Kaori in the manga wasn't realEven if there were cats on the island, they should have been stray, not the cuddly variety. And stray cats avoid people. Especially if they've noticed that said people are loud and violent. Seeing how Kaori is completely insane, her hallucinating a kitten seems not unlikely. And the cat Noriko's seen earlier was actually... a squirrel. Yes. Most definitely. one survivor being the victor. The only difference really, is that The Long Walk is more a battle of attrition.
The original purpose of the Program was to generate Stand Users.If you don't have at least a piece of one of the Arrows, your only options for getting Stand Users are (a) be lucky enough to find someone born with a Stand and sympathetic to you, or (b) put the right person through enough stress that the Stand spontaneously awakens, and that's still a remote chance. So, if someone like Yoshihiro Kira (Dio and Enya clearly approved of him if he was given an Arrow by them, even if that couldn't have been until the 1980s) were in the 1940s Japanese military or government—he's about the right age—and knew about Stands (probably meaning that he himself was born with a Stand, and was in something like Unit 731 with lots of desperate guinea pigs whose own Stands might awaken otherwise unknown), he could come up with this way to both keep the populace too fearful of each other to rebel and make a slowly growing contingent of Super Soldiers via stress/terror/etc. evocation. Ideally, Stand-using survivors (anybody with a Stand is going to have a huge advantage over more normal classmates, so the odds are against an awakened Stand User losing) will end up being just broken enough to no longer be averse to killing, but not so broken/vengeful that they're more of a threat to the bakufu than the bakufu's enemies.