Thirty-three facts not disclosed in the book..

1.Prefects can take points; Ron got it wrong in Order of the Phoenix, which makes him a pretty poor prefect, eh?

2.Fred and George Weasley were born on April Fools' day (no joke).

3.Ginny Weasley's first name is Ginevra, and she is the first female Weasley born for "several generations," says JKR.

4.Arthur Weasley has two brothers.

5.Molly Weasley's maiden name is Prewett.

6.Crookshanks is half Kneazle.

7.The infamous Weasley cousin who was cut from the books was named Mafalda. She was in Slytherin.

8.Dean Thomas's father was killed by Death Eaters when he refused to join them. Neither Dean nor his mother know.
Dean Thomas was named Gary in the first drafts of the Philosopher's Stone.

9.Hagrid, Lily, and James were in Gryffindor. (Hagrid was NOT in Hufflepuff.)

10.Hogwarts has about a thousand students. (True, that number doesn't seem right, but J.K.R. said so, and she's the boss.)

11.James Potter was a Chaser on the Gryffindor Quidditch team (although the movie claimed he was a Seeker).

12.Hermione's birthday is September 19th; Ron's is March 1st.

13.James Potter inherited lots of money and didn't need a well-paying profession.

14.James Potter inherited the Invisibility Cloak from his father.

15.Witches and wizards have longer life-spans than Muggles.

16.The Gringotts' goblins return the Muggle money they acquire back into circulation.

17.The approximate value of a Galleon is about five pounds ($7.30 or 8.00 Euro), though the exchange rate varies.

18.Dumbledore is 150, McGonagall is 70 (and is really an old softy; she just doesn't act like it), Snape is 35 or 36.

19.Hogwarts' school motto, "Draco Dormiens Nunquam Titillandus," means, "Never tickle a sleeping dragon."

20.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 show not your face but your heart's desire."

21.The happiest people do not become ghosts (12). (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?)

22.The Hogwarts teachers do not stay at Hogwarts during the Christmas holidays. However, Filch, Hagrid, and Dumbledore do.

23.A few of the Hogwarts professors have spouses, but that information is restricted for reasons we will find out about later. (5)

24.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 said that a wart had gone out of control. (9)

25.Aragog is an Acromantula (see Fantastic Beasts and Where to Find Them). (6)

26.Dragons can't be domesticated, no matter what Hagrid thinks. (6)

27.There is more to the cats in the story (Crookshanks, Mrs. Figg's cats, Mrs. Norris, etc.) than meets the eye. (9)

28.The animal an Animagus turns into is a reflection on his/her personality. (8)

29.For Hagrid, keeping dangerous creatures is all about overcoming something that could kill him. (6)

30.Azkaban is in a sea north of the North Sea. A very cold sea. (12)

31..You can do unfocused and uncontrolled magic without a wand (like when Harry blows up Aunt Marge), but to perform really good spells, you need a wand. (5)

32. Muggle education is not required for wizard children prior to attending Hogwarts. (9)

33.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 or she turns eleven. (14)