The sour waitress...
Near the start of the movie, when Millie meets Burt at the restaurant, they are served by the biggest sourpuss of an old waitress you could conjure up. She seems to have a particular attitude for Burt, and when I saw this movie the first time, I wondered whether it was because he regularly frequented the place, and hit on older women there, so that he was not trustworthy! But that never comes into the story.
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