After Helen Harvey and Irene Wallace argue in the room, Helen opens the door without turning the handle. Then the door is pulled shut, but no hand is seen on the other side of the door.
When a photo of the missing uncle is shown, viewers see a head portrait of an old man with a dark background in close up; but in long shot, the picture appears to be a full-length shot of a younger man, with a white background.
Harry West is supposedly a carpenter. When Tragg is showing him the locket with his missing wife's picture, the camera focuses on his hand holding the locket. It is obvious that Mr. West has had a manicure and his hands are not those of a laborer.