Continuity mistake: After Laurie wanders into a hospital room and unsuccessfully tries to use the telephone there are a series of shots cutting back and forth between the room and Laurie looking out into the hallway. In the shots from inside the room the telephone shifts position at one point. (00:59:01)
Continuity mistake: When Michael is stalking the hospital corridors there is a scene when he hides in the baby unit and is observing the Head Nurse berate Nurse Karen for being late again. The scene switches back and forth between a close up of the two nurses talking to a shot from Michael's perspective of them from inside the baby unit. In the close up the Head Nurse's body is facing Karen, from Michael's perspective her body is facing towards him on the other side of the nurse station. (00:30:20)
Other mistake: Jimmy the paramedic walks into the major surgery room to find Ms. Alves dead on the stretcher, the blood drained from her body. As he turns to leave he suddenly 'slips' on the pool of blood, falling back first and knocking himself unconscious. However the next shot reveals that the blood pool extends out to the doorway, so there's no way he could have crossed to the stretcher without slipping in the first place while entering the room.
Other mistake: After the two doctors and the sheriff pull up in the parking lot and then enter the hospital, Michael suddenly appears to Laurie, and she runs from him across the lot toward the same entrance, and suddenly the doors are locked. There is no way this would be, as the doctors and the sheriff would have had to stop and unlock the entrance before entering themselves, which they did not do.
Continuity mistake: At the beginning of the movie, the front door lights on the Doyle house are on, then off, then on again in just a few different shots.