The blood censorship that occurred with the Nintendo version was all done without the game's chief being told. He didn't find out until after the release.
Strangely enough, when the 3DO version was released in Japan, it was under the overseas name instead of the original Japanese title.
Either coincidence or not, the ninja Hattori Hanzo is actually a real samurai in medieval Japan. The "real" Hattori Hanzo served under the daimyo Tokugawa Ieyasu. Fans of Nobunaga no Yabô: Zenkokuban (1986) will recognize this.