Continuity mistake: In the scene towards the end of the movie when Julia is in the mental hospital, it shows her getting out of bed and trying the door, which is locked. The handle to the door is on the left side. But if you go back and watch the alternate ending and she goes to try the door, the handle is on the right side of the door.
Continuity mistake: When Julia's car breaks down in the middle of the highway she grabs her flashlight, turns it on and begins to open the door. Now the camera changes for a shot on the outside of the car to view Julia getting out and when she does get out, the flashlight is mistakenly off and she turns it back on.