Trivia: The costume department tried in vain to produce Luna's radish-like earrings. Evana Lynch made her own - they're the ones she wears in the film.
Trivia: Helen McCrory was originally cast as Bellatrix Lestrange, but dropped out due to her pregnancy. She was replaced by Helena Bonham Carter. In 2007, McCrory was cast as Bellatrix's sister, Narcissa Malfoy, in Harry Potter and the Half-Blood Prince.
Trivia: The director and other persons of importance had cut Kreacher out of the film. JKR told them that she couldn't tell them what to do, but the final film wouldn't make sense if they didn't introduce Kreacher in this one. Five minutes later, Kreacher was back in.
Trivia: The barman seen with the goat at the shabby Hog's Head Inn where Harry and Hermione hold the first Dumbledore's Army meeting is Aberforth Dumbledore, Albus' brother. In the novels he runs the Hog's Head Inn and was investigated for performing improper magic on goats. (This was confirmed by J.K. Rowling in an online chat at The Leaky Cauldron.)
Trivia: 15,000 girls auditioned for the role of Luna Lovegood.
Trivia: Over 5000 kittens were filmed for the decorative plates in Umbridge's office.
Trivia: When Harry returns to the dorms after his first kiss with Cho, to tell his friends all about it, Harry, Ron, and Hermione break up laughing towards the end. The laughter from all three actors is real. Director David Yates thought it was good for the scene and decided to leave it in.
Trivia: At the end of the movie, director David Yates appears as one of the magical moving portraits hanging up in Hogwarts.
Answer: When Voldemort originally attacked Harry, he was acting on information provided to him by Snape. But Snape's information was not complete, ergo why Voldemort lost his powers. He wants the prophecy in order to hear it in its entirety, because he believes it will give him the information he needs to kill Harry.
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