• Alfonso Cuarón was offered the chance to direct this installment in the series, but declined as he would still be working on Harry Potter and the Prisoner of Azkaban (2004).
• Over 3,000 girls turned up at the auditions for the role of Cho Chang, in London on 7 February 2004.
• The Dursleys were cut from the film due to time constraints.
• According to rumors that circulated the Internet, both Rowan Atkinson and John Malkovich were considered for the role of Lord Voldemort. Both were proven to be untrue; Malkovich is, of course, an American, and doesn't meet the "all-British-cast" requirement.
• Rumors on the Internet of the a Scottish actor being cast as Viktor Krum were halted when it was announced that, as originally planned by the producers, a Bulgarian would in fact play the part. Perhaps these rumors arose because the Bulgarian was discovered in England and not in Sofia, where there was a casting call for the part of the International Quidditch Champion. Stanislav Yanevski, a Bulgarian student living in London, has been cast in the role.
• Mike Newell decided against the studio's original idea of adapting the 734 page book into two separate films to be released several months apart, figuring that he could cut enough of the book's bulky subplots to make a workable film.
• Mike Newell only received $1 million to direct where Chris Columbus recieved $10 million plus a percentage of the gross to direct "Harry Potter and the Sorceror's Stone (2001)".
• Philippine actress Heart Evangelista was considered for the role of Cho Chang and Katie Leung eventually beat more than 3,000 girls for the part.
• According to Mike Newell, the movie is set to become the most expensive movie ever, with a budget of $308 million. It is around $10 million more than the budget of the entire Lord of the Rings Trilogy, which was nearly $300 million. Currently, the two movies with the largest budgets are Titanic (1997) and Spider Man 2 (2004), both having a budget of $200 million.
• During the underwater filming, Daniel Radcliffe, a couple of the cast members, and all of the underwater crew posed for a photo which he later sent out as a Christmas card with Rudolph noses and antlers Photoshopped on everyone's faces.
• All underwater filming involving the teen actors was only allowed 15 seconds per take. After this time, safety divers swam in with scuba regulators to allow them to breathe without having to surface. These scenes were shot in a huge purpose-built tank with a blue-screen background. Daniel Radcliffe alone logged around 45 hours underwater during the course of filming, at one point during training he inadvertently signaled that he was drowning, sending the crew into a huge panic to bring him back up to surface.
• Daniel Radcliffe suffered two ear infections following the underwater filming.
• As Ron, Harry and Hermione are talking in the Great Hall, before George and Fred attempt to enter their names in the Goblet, Hermione is reading a book. We can't see the title, but the cover features the harlequin pattern of the US editions of the Harry Potter novels.
• John Williams passed on scoring this movie in favor of Memoirs of a Geisha (2005).
• The animal used to demonstrate the Unforgivable Curses is a tailless whip scorpion.
• When filming his scenes as Professor Dumbledore, Michael Gambon wears street clothes under his flimsy costume.
• The tune you hear the teens sing to "Hogwarts, Hogwarts, Hoggy Warty Hogwarts" was written by Mike Newell. (Composer Patrick Doyle asked Newell how he thought the song should go, and Doyle used the same tune that Newell hummed off the top of his head.)
• Mike Newell staged a brawl with one of the twins, both to demonstrate what he wanted for a scene between the twins, and also to undermine his own "authority figure" status ("They were calling me 'sir'!") The fight got so intense that he fractured a rib in the process.

Information courtesy of IMDb.

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