As Lorna runs into the hospital, there's nothing outside the door. But the shot from inside shows a small wall just outside the door which she would have had to jump over or go around to enter.
When Lorna has a mental breakdown in a movie theater and rushes up to freak out on stage in front of screen, it's obvious that film on screen is a rear projection because neither she nor ushers trying to restrain her have projected images on them nor do they cast shadows on screen.