Richard Harris only agreed to play Albus Dumbledore because his 11-year-old granddaughter threatened to never speak to him again if he didn’t.
Daniel Radcliffe was in the bathtub when he learned that he had been chosen to play Harry Potter.
Rosie O’Donnell and Robin Williams wanted roles in the first Harry Potter film and were willing to do it without pay.
Devon Murray, who played Seamus, holds the record for most number of prop wands broken while filming. His number? 10.
The radish earrings worn by Luna Lovegood were actually made by Evanna Lynch, the actress who portrayed her in the movie.
Hugh Grant had been cast to play Gilderoy Lockhart but didn’t push through because of schedule conflicts.
Ian McKellen, who appeared as Gandalf in The Lord of the Rings, turned down the role of Dumbledore saying ‘I had enough trouble living up to one legend. Two would be too much to hope for.’
Director Alfonso Cuaron asked the three lead actors to write an essay about their characters.
Emma Watson did what Hermione would have done, she wrote a 16-page essay. Daniel Radcliffe wrote a one-page essay while Rupert Grint, true to his character Ron, claimed he forgot to write his.