During the scene where Ed Wood is filming Bela Lugosi coming out of his home, there is a walkway leading from the sidewalk to the porch. Whenever we see a shot from the street, we can see the walkway. Whenever we see a shot from the house, the walkway has disappeared.
If you look closely in some of the scenes, you will see that the walkway curves and is not a straight path to the house. Therefore, it is possible that this is not a slip-up at all since it would be possible that at a certain camera angle, the walkway may not be visible at all. Then again, I may be wrong.