Trivia: The movie makers really wanted the audience to believe that Michael Rooker was the killer, rather than Leland Orser. So much so that Rooker actually played the killer in almost all the scenes where the killer wears a mask. When you see the eyes of the killer through the mask the eyes are Rooker's.
Trivia: The strange incantation heard at the beginning of the orgy scene is a fragment of a Romanian Orthodox Church sermon played backwards. If you play it backwards you'll notice that there are two main voices (in the movie is supposed to be only one - the voice of the "great priest") and a choir.
Trivia: After Frankie tears up the apartment, possessed by the priest, she goes to the bed and levitates in a cruciform position. During this scene, there is a quick, sweeping shot of the wall and, if you watch it in slow motion, you can see a wall of boxes of Ritz crackers. This is either an obvious endorsement or some kind of inside joke.
Trivia: This film is actually the second sequel to "Ringu." The first sequel, "Rasen" was shot back-to-back with "Ringu" with a different crew and director, and some of the original cast. It was then released simultaneously in theaters alongside "Ringu", in hopes that fans of "Ringu" would go to see it. After "Rasen" failed with both critics and audiences, the director of "Ringu" (Hideo Nakata) was re-hired with the original screenwriter and the original cast to film this "alternative" sequel which is written as though "Rasen" never happened. This film want on to be a success, while "Rasen" became the "lost sequel."