Other mistake: In the Forbidden Forest, after Grawp has put Hermione down after grabbing her, he turns round and bends down to pick something up. When the shot turns to Ron, Hermione and Harry they are still looking up at Grawp even though he's bending down. Their position doesn't move. Ron even looks Grawp up and down, even though he's still bent over with his back to the students. (01:27:10)

Harry Potter and the Order of the Phoenix (2007)
1 other mistake - chronological order
Directed by: David Yates
Starring: Gary Oldman, Ralph Fiennes, Alan Rickman, Brendan Gleeson, Daniel Radcliffe, Emma Watson, Robert Pattinson, Rupert Grint, Imelda Staunton
Genres: Adventure, Family, Fantasy, Harry Potter

Revealing mistake: In the Forbidden Forest, HRH are introduced to Grawp. Just as the giant lifts Hermione off the ground, in the shot from behind her, Hermione's legs disappear below her calves; the digital lines are actually visible. Slow-mo is not necessary. (Only visible on fullscreen DVD.) (01:29:40)
Dolores Umbridge: You applied first for the defense against the dark arts post, I believe?
Professor Snape: Yes.
Dolores Umbridge: But you were unsuccessful?
Professor Snape: Obviously.
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.
Question: I don't understand why Voldemort needed the prophecy from the Department of Mysteries. Doesn't he already know that Harry can possibly kill him, since Harry conquered him on the night of James and Lily's murders?
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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.
Cubs Fan ★