Continuity mistake: When Ed is filming Bela Lugosi's last footage in front of his house, he is standing on the sidewalk, facing the house. From the camera's point of view there is a concrete walk leading to the porch, yet when there's a cut to the house's view, the walk is gone. It's just grass.
Continuity mistake: At the wrap party for "Bride of the Atom," when Dolores starts screaming at Ed "These movies are TERRIBLE!" her hair is curled in ringlets that hang down to the tops of her shoulders. She then stalks out of the warehouse, and Ed follows her. When he catches up to her in the parking lot, and she tells him she is leaving him, you can clearly see that her hair is suddenly much shorter and curlier.