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.
Session 9 (2001)
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Directed by: Brad Anderson
Starring: Josh Lucas, David Caruso, Paul Guilfoyle, Stephen Gevedon
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Henry: What are you... doing... here?
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.