Gwendolyn Briggs is talking to Mildred outside of her door inside of a hallway yet the entrance to the room goes outside to the parking lot. There are no hallways in the motel. Motels are where your drive your car straight to the outside door.
When Lenore Osgood says the technical term for throat (regarding Dr. Hanover's impending cut throat), she mispronounces Larynx as Lar-nix.