Revealing mistake: When Nicolas Cage drops the possessed camcorder, he does it putting it on a newspaper. The movie is set in New York but the newspaper has an article talking about the Mackenzie Valley, in Canada, and of course it is where the movie was shot. In fact, you can identify the paper as the Toronto Star, Sunday September 28 edition, so also outside the proposed timeframe. (00:41:50)
Revealing mistake: When Mike browses his own everyday phone looking at the photos, the phone shows a "no SIM" message. (01:00:00)