Trivia: When Neville receives a Remembrall from his grandmother, it glows red to inform him that he forgot something. Neville says that he can't remember what he forgot. If you look closely, Neville is the only student in the Great Hall not wearing his robe. He most likely forgot to put his robe on.
Trivia: For anyone who hasn't read the book: The inscription on top of the Mirror of Erised says "erised stra ehru oyt ube cafru oyt on wohsi". If you read the inscription backwards it says "I show not your face but your heart's desire".
Trivia: The Hogwarts motto, 'Draco Dormiens Nunquam Titilandus', is Latin, and means 'Never tickle a sleeping dragon.'
Trivia: J. K. Rowling recently surpassed Agatha Christie as the world's most-published female author.
Trivia: Susan Bones, who was sorted into Hufflepuff, is shown prominently throughout the film, even in some of the Gryffindor classes. The reason she is used so much is that she is actually Chris Columbus's daughter, Eleanor.
Trivia: The name 'Voldemort' comes from the French 'vol de mort' which means 'flight of death'. This is perfectly descriptive of Voldemort, and is another interesting name from the brilliant mind of J. K. Rowling.
Trivia: J.K Rowling declined the offer to play Lily Potter.
Trivia: Book author J.K. Rowling wanted former Monty Python member Terry Gilliam to direct. However, Warner Bros. chose Chris Columbus, who had experience directing child actors (most notably, Macauly Culkin in the "Home Alone" films). Interesingly, John Cleese, who was in Python with Gilliam, appears in the film as Nearly Headless Nick.