At the 0:10:47 mark shows Carol vacuuming and holding the vacuum cord, but a motor isn't heard, only the sound of the vacuum rolling across the carpet.
When Judy is in the convertible with her parents, about a half hour into the picture, she turns around to say good-bye to Wilbur when a moving reflection of the boom microphone is visible on the trunk of the car. Usually in that era of film, a car's finish is dulled, dirtied or matte to prevent this. Earlier in the scene, what appears to be a man standing beside the camera rig is also reflected in the polished finish of the same car.
When the Warden arrives at the campground with the Count and Carol, he tells them to get his gun from his "left hand" pocket. The gun was in his right back pocket.