1.In the first and third film, the exact same line was used: “That was wicked Harry!” It was used in the first by a crowd of first years after Harry rushed on his broom to catch Neville’s remembrall after it was thrown by Draco Malfoy. It was used a second time in the third movie by a crowd of third years after Harry successfully rode the Hippogriff Buckbeak.
2.The actor for Bill Weasley (Domnhall Gleason) is the son of the actor for Mad Eye Moody (Brendan Gleason).
3.The actress for Hermoine (Emma Watson) and and actress for Professor Trelawney (Emma Thompson) share the same first name and birthday (April 15th).
4.The actor for Seamus (Devon Murray) is 5 feet 2 inches tall.
5.Daniel Radcliffe stated once that the day he learned he would be cast as Harry Potter was the best day of his life.
6.The actors for Fred and George are not redheads. They are actually brown-haired.
7.The people who died in the Battle of Hogwarts are Remus, Tonks, Fred, Lavender, Snape, Colin Creevey(not shown or mentioned in movie) Bellatrix and Voldemort.
8.The actor for the first Dumbledore was born 10 years before the actor for the second Dumbledore.
9. The most high profile actors in the Harry Potter Films are: Ralph Fiennes, Kelly McDonald, Maggie Smith, Emma Thompson, Kenneth Branagh, Michael Gambon, Richard Harris, and Alan Rickman.