Moaning Myrtle
The actress who played the ever lovely Moaning Myrtle was actually 37 years old at the time Harry Potter and the Chamber of Secrets was filmed. She was the oldest actress to ever portray a student at Hogwarts. Not bad.
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Potty Mouth
The character of Ron Weasley originally swore a lot, but JK Rowling’s publisher wouldn’t let her use that kind of language as it would not be appropriate for young readers.