The films give the impression that Beauxbatons is an all-girls school while Durmstrang is an all-boys school. This is not the case in the books
Because of all the filming underwater, Radcliffe suffered from two ear infections.
At one point, Radcliffe accidentally signaled he was drowning and sent the entire crew into a massive panic to save him.
Costume designer Jany Temime believed that Hermione’s dress in the Yule Ball scene was her “Cinderella moment” and the design dress multiple times.
The kids had three weeks to practice their dancing for the Yule-ball Waltz.
The books in Dumbledore’s library are actually phone books in disguise.
The studio originally wanted The Goblet of Fire to be made into two separate films, released several months apart.