(Found on MuggleNet.com)
(Facts go from newest to oldest, with newest on top)
◦Prefects can take points; Ron got it wrong in Order of the Phoenix, which makes him a pretty poor prefect, eh?
◦Fred and George Weasley were born on April Fools' giorno (no joke).
◦Ginny Weasley's first name is Ginevra, and she is the first female Weasley born for "several generations," says JKR.
◦Arthur Weasley has two brothers.
◦Molly Weasley's maiden name is Prewett.
◦Crookshanks is half Kneazle.
◦The infamous Weasley cousin who was cut from the libri was named Mafalda. She was in Slytherin.
◦Dean Thomas's father was killed da Death Eaters when he refused to unisciti them. Neither Dean nor his mother know.
◦Dean Thomas was named Gary in the first drafts of the Philosopher's Stone.
◦Hagrid, Lily, and James were in Gryffindor. (Hagrid was NOT in Hufflepuff.)
◦Hogwarts has about a thousand students. (True, that number doesn't seem right, but J.K.R. detto so, and she's the boss.)
◦James Potter was a Chaser on the Gryffindor Quidditch team (although the movie claimed he was a Seeker).
◦Hermione's birthday is September 19th; Ron's is March 1st.
◦James Potter inherited lots of money and didn't need a well-paying profession.
◦James Potter inherited the Invisibility mantello from his father.
◦Witches and wizards have longer life-spans than Muggles.
◦The Gringotts' goblins return the Muggle money they acquire back into circulation.
◦The approximate value of a Galleon is about five pounds ($7.30 o 8.00 Euro), though the exchange rate varies.
◦Dumbledore is 150, McGonagall is 70 (and is really an old softy; she just doesn't act like it), Snape is 35 o 36.
◦Hogwarts' school motto, "Draco Dormiens Nunquam Titillandus," means, "Never tickle a sleeping dragon."
◦If placed in front of a mirror, the inscription on the Mirror of Erised ("Erised stra ehru oyt ube cafru oyt on wohsi") reads, "I mostra not your face but your heart's desire."
◦The happiest people do not become ghosts.(Therefore, we can assume that ghosts are people that died while sad, angry, etc. Myrtle was teased; Nearly Headless Nick didn't have his head completely chopped off; the Bloody Baron was...lonely?)
◦The Hogwarts teachers do not stay at Hogwarts during the Natale holidays. However, Filch, Hagrid, and Dumbledore do.
◦A few of the Hogwarts professors have spouses, but that information is restricted for reasons we will find out about later.
◦To remove the tail that Hagrid gave Dudley in the hut on the rock, the Dursleys went to a private hospital where the staff was very discreet, and detto that a wart had gone out of control.
◦Aragog is an Acromantula (see Fantastic Beasts and Where to Find Them).
◦Dragons can't be domesticated, no matter what Hagrid thinks.
◦There is più to the Gatti in the story (Crookshanks, Mrs. Figg's cats, Mrs. Norris, etc.) than meets the eye.
◦The animal an Animagus turns into is a reflection on his/her personality.
◦For Hagrid, keeping dangerous creatures is all about overcoming something that could kill him.
◦Azkaban is in a sea north of the North Sea. A very cold sea.
◦You can do unfocused and uncontrolled magic without a wand (like when Harry blows up Aunt Marge), but to perform really good spells, te need a wand.
◦Muggle education is not required for wizard children prior to attending Hogwarts.
◦A magical quill detects the birth of every magical child and records it in a book and Professor McGonagall sends an owl to each child when he o she turns eleven.