When Professor Slughorn is speaking to Harry, Rowling illustrates his disdain for students he doesn't consider worthy by having him refer to Ron by the wrong name. The egg is that instead of Ron, he says Rupert. The actor who plays Ron in the movies is...
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Throughout the book, Harry Potter and the Half-Blood Prince, you'll notice that there is a character named Demelza Robins. Demelza is obviously a different name, but Daniel Radcliffe, the actor who plays Harry Potter in the films, has one specific charity...
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