At around 5 min Susan's face and hair go from wet to dry.
When Dr. Andrews plays back the audio recording of his hypnosis session with Susan, the high pitched "demon cue" in the movie's soundtrack has also been captured on Dr. Andrews' cassette.
When Oliver goes to rescue the drunk guy from the burning car the door is already open.
When the burning car blows up the door is open and clearly no one inside.
When Susan is possessed, she uses telekinesis to lift another character over the balcony of the stairs and the equipment used to lift the actress is visible at the top of the screen.
Susan's Doctors appointment was at 2:30.After the appointment the doctor is shown talking on the phone and the time behind him is 11:37.