The rear window scenery for various car trips is used repeatedly. You can see the same kids playing in the street in each shot. At 7 min Alan Curtis drives Elizabeth home from his office following her shopping trip. Again, at 49 min when Alan drives Elizabeth home from the train station. Again, at 1 hour 16 min as Freddie drives Alan home. Further, visible through the rear window, turns have obviously occurred but the driver rarely if ever turns the steering wheel.
At 12 min. Mr. Johnson is in Room 6. As he enters the bathroom there are no stockings hanging near the door. He walks to the window then returns to the door to turn on the light and walks into stockings. At 13 minutes when the maid enters the room the stockings are now hanging close to the wall which would have made it impossible to walk into without hitting the wall.