Factual error: When Mike first starts listening to the session tapes, the camera does a slow pan down the label on the box. Quite clearly, we can see that the patient's diagnosis is listed as "D.I.D.", along with a few names. Since the hospital closed in the mid 80's, it is not possible for her to have that diagnosis. Before the early 1990's, D.I.D. (Dissociative Identity Disorder) was known as M.P.D. (Multiple Personality Disorder). In later scenes it is correctly listed in the woman's files as Multiple Personality.
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.TedStixon
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