Factual error: A few days prior to Warrens' visit to the Hodgson's family, Janet watches the British comedy TV series "The Goodies" on TV. The episode that she was watching actually aired on December 22 of the year in the UK. Later, when Ed records the interview with Janet, it turns out that it's December the 21st. (00:28:20 - 00:31:25)Bunch Son
Revealing mistake: During the scene near the end, at the climax of the film, when Ed is holding onto Janet for dear life outside her bedroom window, as Lorraine rushes over and pulls them back into the house, 'Janet' is a dummy.
Continuity mistake: In the middle of the movie during a non ghost activity kitchen shot the Pyrex bowl on the top shelf moves slightly from one shot to the next. You can see the full frontal pattern in majority of the movie, however, it moves slightly, revealing where there is no pattern visible on the bowl.