Thank you to: ¡EEK! (EXPERIMENTAL ENGINEERING KORPORATION)
During the opening credits, among the many stills of the girls' deaths, there is a piece of paper with the words, "Long is the way that out of hell [sic] leads up to light." This is a slightly abbreviated quote from John Milton's "Paradise Lost." The exact quote is, ""Long is the way and hard, that out of Hell leads up to light." The quote is also used in "Se7en" (1995).