J.K Rowling wanted to kill either Arthur Weasley or Sirius Black in the 5th book but she preferred not to make 7 children fatherless.
Ron worked with George at WWW for some time and then became an Auror.
Dean Thomas is not muggle born, but he is half-blood. His father was a wizard, and was killed by Death Eaters.
Molly and Arthur Weasley are distant cousins of Sirius Black's ancestors.
13 is considered an unlucky number which is also the ages between Remus and Tonks.
Hermione joined the Ministry's Department for the regulation and control of magical creatures, incorporating beasts, beings and spirits devisions, and she helped improve the house elves' welfare.
Ron's patronus charm is a russel terrier.
Arthur Weasley didn't have any sisters, and Ginny is the the first Weasley female born for several generations.
Hedwig was played by a snowy owl named Gizmo.
Harry became an Auror when he was 17.
Hermione's middle name was changed from Jane to Jean to avoid the same middle name as Dolores Umbridge.
The word "Quidditch" comes from the names of the balls: "Qu"- stands for Quaffle, "dd" - would stand for Bludger and "itch" stands for Snitch.
Voldemort's wand is made of yew, yew is symbolic for death and rebirth.
The name Voldemort comes from the French words meaning "Fly from death" which is basically what Voldemort and his people do.
The numbers are symbolic in the Harry Potter series:
- For 3 there is a golden trio.
- For 7 there are 7 players in a Quidditch team and 7 years to complete at Hogwarts. 7 is also the most powerful magical number, hence the reason Voldemort made 7 horcruxes.
Hedwig's death in Harry Potter and the Deathly Hallows represents Harry's loss of innocence and coming of age.
The actress who portrayed Moaning Myrtle was actually 37 years old and is the oldest person to ever portray a Hogwarts student.
The dementors were inspired by JK's depression she suffered year prior to the writing book.