Trivia: A massive subplot was removed from the film. It was going to be shown throughout the film that a crazy homeless woman was secretly living in the hospital. She'd eerily observe the workers and be a red herring to throw off the audience. SPOILERS. Finally, after she witnesses Gordon kill everyone, she would sneak up and kill him as "revenge." However, her subplot was removed as audiences were confused (thinking she was Mary from the audio tapes) and the director wanted to streamline the plot.
Trivia: The movie was filmed on Sony High Definition camcorders as opposed to traditional 16 or 35mm film. The camcorders used were among the first to offer the cinema standard 24 frames-per-second as an option (as compared to the home-video standard of 30fps) which helped make the image look closer to cinema-quality. The movie was one of the first mainstream films shot primarily on digital video.
Trivia: The film was shot primarily at the Danvers State Asylum, an abandoned hospital. The script was written around the shooting location based on what rooms and corridors were safe to shoot in. Little to no set-dressing had to be done for the film, as it was suitably dilapidated and filled with abandoned medical equipment, which helped add to the film's atmosphere.
