To protect the final Harry Potter book from leaking to the public, a 10-million pounds security operation featuring satellite tracking systems and armed security with K-9 units was used. A Scholastic lawyer also physically sat on a copy during a flight to prevent any potential loss.
In the Harry Potter books, Parvati Patil of Gryffindor has an identical twin Padma Patil of Ravenclaw, to illustrate the unpredictability of the Sorting Hat. In the movies, however, Parvati (Shefali Chowdhury) and Padma (Afshan Azad) are not only both in Gryffindor but are played, surprisingly, by unrelated actresses.
In the movie adaption of Goblet of Fire, the audience is given the impression that Beauxbatons is an all-girls magical academy whereas, Durmstrang is an all-boys one. In the books, however, both schools are co-ed, and in fact, in the books, the Patil twins leave Harry and Ron to spend time with boys from Beauxbatons.
4Sleekeazy's Hair Potion
In the novel, Hermione uses the Sleekeazy's Hair Potion, a hair care potion, to straighten her hair for Yule Ball. J.K. Rowling would later reveal on Pottermore, as part of the Potter family background, that this potion was invented by Fleamont Potter, paternal grandfather of Harry Potter.
In the fourth movie, the Weasleys have really high seats at the Quidditch World Cup. The Malfoys make fun of them for being so high up in the "nosebleed section." In the book however the Weasleys have just as good as or even better seats than the Malfoys. The tickets were given to Arthur Weasley by Ludo Bagman at the Ministry of Magic, whose character is cut out of this movie due to time. Ludo's character is also a degenerate gambler, and throughout the book tries to help Harry cheat in the Triwizard tournament; Harry refuses his help.
6Longbottom & Weasley banned
While filming Order of the Phoenix, Alan Rickman banned Matthew Lewis (Neville Longbottom) and Rupert Grint (Ron Weasley) from being within 5 meters of his new BMW, because during the making of Harry Potter and the Goblet of Fire (2005), they spilled milkshake in his car.
7Dobby and Winky
Some scenes of the elves Dobby and Winky were cut from the Goblet of Fire due to time constraints. However, if you watch carefully in the first campsite scene, right after Ginny points to something and says "Look!" you can see two House Elves riding on llamas. They go by very fast, so they're hard to see.
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8Black family tree tapestry
J.K. Rowling provided over 70 names for the Black family tree tapestry, complete with details of relations between each and every member, whose were to be scorched and so on.
9Black Family Tree
Several members of the Black family are named after astronomical objects. You can see some of the names in the scene when Sirius and Harry are in the family tree room. Sirius, Regulus, Andromeda, Arcturus, Bellatrix, and Cygnus are the ones that can be seen.
According to the original script, the character of Kreacher was not intended to be in Order of the Pheonix at all. But after J.K. Rowling read the script, she more or less insisted on him needing to be there to avoid some serious problems with future installments of the series. Though Kreacher has no noticeable impact on the plot or story as it's presented in the film, a couple of scenes with him were added at the last minute based on this request.