Diagon Alley was made up because of the word diagonally
Harry Potter's eye weren't green in the movies because Daniel Radcliffe was allergic to the contacts that were given to him in the begnining of post production.
During the filming of one of the films, the director told the actors to write essays about their characters. Emma wrote 10 pages, Daniel wrote a page, and Rupert didn't write anything.
Dumbledore is the old English word for "bumblebee", J.K. Rowling had made his name that way because she imagined him humming to himself.
J.K. rowling regrets the descision of Ron and Hermione together.
Tom Felton's ,Draco Malfoy's, robe was sewn shut because he eept sneaking food on set and leaving it in his pockets, and it would go bad or melt.
