* CelebrityVoiceActor: Hiruma voiced by Atsushi Tamura, member of the [[BokeAndTsukkomiRoutine Manzai duo London Booth No.1 No.2 along with Ryo Tamura]].
* HeAlsoDid: Yusuke Murata, the artist for the series, managed to win the ''VideoGame/MegaMan'' Robot Master design contest twice. He created both Dust Man from ''VideoGame/MegaMan4'' and Crystal Man from ''VideoGame/MegaMan5''. Incidentally, one of his friends created Star Man, also from '''5''.
* NoDubForYou: The English dub for American audiences was canceled because of the deal with NFL Rush falling through, and the fact that the manga barely sells enough copies in America to avoid cancellation.

* The NFL sponsored an [[{{Manga/Eyeshield21}} anime about American football in Japan]] -- a ''very successful'' series.