11The Order of the Phoenix and The Half-Blood Prince
On the weekends after "The Order of the Phoenix" and "The Half-Blood Prince" was published, young people's emergency room visits were reduced by almost half.
12Jim Dale
Jim Dale performed 300 voices for the Harry Potter Audiobooks and had to playback recordings of himself on set to remember each one, each time.
13Jason Isaacs
Jason Isaacs who played Lucius Malfoy in the Harry Potter films was once caught trying to steal his wand from the set.
14Matthew Lewis
Matthew Lewis wore a fat suit, fake teeth, and more through most of the Harry Potter films to make Neville Longbottom appear more unattractive.
15Daniel Radcliffe
Daniel Radcliffe is a recovering alcoholic who started drinking during the last few Harry Potter Movies.
16Dementors
The Dementors in Harry Potter were meant to symbolize J.K. Rowling's depression.
17Shirley Henderson
Shirley Henderson, the girl who played Moaning Myrtle (the ghost in the bathroom) was actually 37 years old when she played the character in the Harry Potter series.
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18Hogwarts
In the Harry Potter universe, Hogwarts is located in Scotland, not England.
19Quidditch rules
J.K. Rowling deleted the rules of Quidditch from the original Harry Potter manuscript "because she thought it made it too technical". Her agent made her put them back in.
20Voldemort
Voldemort was 71 years old when he died in Harry Potter.
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