Yes, alot of things are changed in the movies. Just like Hermione's hair is supposed to be horrible looking and messy as describe in the book, but in the movies it looks fine. So when the "big" transformation happens at the Yule Ball, where she is supposed to look REALLY stunning, she really doesnt look different at all. It was very dissapointing, they just want her to look like a "pretty" girl, but her character isnt supposed to change "beauty" wise until later...
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