Factual error: During the second half of the film, set in Britain, Peter Mitchell is hiding away from a woman. She opens the door and asks "What are you doing in my closet?" She seems to talk with an upper class British accent, but she wouldn't use the American word "closet," but use either "wardrobe" or "cupboard."
Continuity mistake: There is a scene where Sylvia is trying to get a cake out of the cake pan. In the first shot, from farther back, you see her shake the pan then sit it down and take off her oven mitts. The shot continues to go in and out throughout the scene. Every time the shot is zoomed in you can see Sylvia's oven mitts on her hands. Every time the shot backs up you can see the oven mitts on the table.