1001 Video GamesFatal Frame II: Crimson Butterfly appears in the book 1001 Video Games You Must Play Before You Die by General Editor Tony Mott.
GhostsSeveral hidden ghosts in the games were changed depending on what region the game was released in. In Japan and North America the PS2 version featured ghosts of the creators as well as the editors from gaming magazines from the respective countries. In Europe these ghosts were replaced with contest winners. When the Xbox re-release came out these were replaced with yet another set of ghosts from another contest in Japan, although the European versions remained unchanged.
OriginThe idea of a camera absorbing ghosts is based on a superstition that having your picture taken steals your soul and the only way it can be returned is to burn the film. There are followers of religions around today that believe this to be true including places in Mexico. The ghosts you encounter are all lost souls.
TitleThe original Japanese title Rei: Beni Chou means "Zero: Crimson Butterfly". The PAL release title is actually closer to the original than the NTSC one.
Unlockable ClothingIn addition to the several sets of swimsuits for Mio and Mayu that were added for the Xbox Director's Cut, Tecmo also added outfits from other Tecmo games. Completing Hard difficulty lets Mio and Mayu dress up like the heroines of Deception II and III, while completing Mission Mode with any score rewards the twins with the costumes of Ayane and Kasumi from the Dead or Alive series.
Information also contributed by festershinetop and Lain Crowley