Hair Cut
From the Trivia section:
The scene in which Deborah Kerr cuts her own hair and then cuts to her sunning with a perfectly quaffed hairstyle got such a big laugh at the initial screenings of the film that producers debated removing the scene. However, they couldn't figure out another way to explain Kerr's change of hairstyle, so they kept the improbable scenes intact
I just saw this scene and had to look it up here to see if there was an explanation. Not only was the hair cut, it looked like it had been set in curlers.
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