In scenes that take place in unmistakably Parisian exterior locations, Angela Lansbury is doubled by a different actress of similar height and weight who wears the same outfits, but whose hair is slightly darker and is cut shorter in the back. In most scenes, the actress is seen only from the rear at a distance with cars positioned in front of her, and when she arrives at the Jules Verne Restaurant, her face is obscured by another character's hat as she turns to face the camera; under normal circumstances, these would be unusual ways to block scenes that feature the star of a show.
Indoor scenes (hotel room, etc) 120 volt USA style electrical outlets and switches are seen. France uses 230 volt 50 cycle current.