History Trivia / HarryPotterAndTheChamberOfSecrets

* NeverWorkWithChildrenOrAnimals: A minor example at the end. Hermione was down in the script to hug Harry and Ron, but Creator/EmmaWatson was too embarrassed to hug both boys in front of a set full of people (it's in the Great Hall). They came up with the compromise that she would only hug Harry and give Ron an awkward handshake. In post-production, they even had to slow down the film when Hermione is hugging Harry - because Emma kept breaking it too quickly.

** Lucius attempting Avada Kedavra on Harry was ad-libbed by Creator/JasonIsaacs. At this point he had only read the fourth book and that was the only spell he could remember. Additionally Isaacs had to keep his head tilted back to prevent the long blond hair from falling in front of his face - which helped make Lucius appear even more haughty and snobby. He even improvised kicking Dobby; he lost track of where he was supposed to look during filming, to which Chris Columbus told him to look anywhere and the effects team would put Dobby there. He added in the kick for good measure, and Columbus initially thought he was slipping before Isaacs explained it.

** Creator/JasonIsaacs said in the 20th Anniversary reunion special that in a deleted scene taking place in Borgin & Burkes, Lucius smacks Draco's hand with the snake-head on his ClassyCane and scolds Draco to not touch anything. However, the snake-head had little sharp fangs that punctured Creator/TomFelton's hand. Isaacs immediately broke character to apologize profusely to a tearful Felton, who said, "it's alright, it's good for the scene..."

* EnforcedMethodActing:

* PosthumousCredit: Creator/RichardHarris managed to complete all of his scenes before he succumbed to Hodgkin's disease on 25 October 2002. He is still given a credit in the finished film.

* TheOtherDarrin: Sort of. Madam Pomfrey only appeared in the background of the first film, played by an extra. Here Gemma Jones assumes the role and keeps it for the remainder of the series.

* DuellingMovies: In a repeat of their respective previous instalments' duel the previous year, the film came out one month before the movie of ''Film/TheLordOfTheRingsTheTwoTowers''. As before, the outcome was pretty much a tie and both were massive box office hits. To date, this is the last time the two franchises have competed at the box office. The ''Rings'' trilogy concluded in 2003 while the third ''Potter'' film came out in 2004, and the trilogy of ''Film/TheHobbit'' released all its films between ''[[Film/HarryPotterAndTheDeathlyHallows Deathly Hallows]], Part 2'' and ''Film/FantasticBeastsAndWhereToFindThem''.

* DuellingMovies: In a repeat of their respective previous instalments' duel the previous year, the film came out one month before the movie of Film/TheLordOfTheRingsTheTwoTowers. As before, the outcome was pretty much a tie and both were massive box office hits.

* DuellingMovies: In a repeat of their respective previous instalments' duel the previous year, the film came out one month before the movie of Film/TheLordOfTheRingsTheTwoTowers. As before, the outcome was pretty much a tie and both were massive box office hits.

* {{Jossed}}:
** Many people think that Professor Gilderoy Lockhart is a character based on Creator/JKRowling's ex-husband. Rowling has said on her official website that Lockhart is based in an egocentric person that she really dislikes, but he is not her ex-husband.
** For a few years, fans debated whether Ginny actually sent Harry that singing valentine. On an initial readthrough, it's implied by her behaviour, but on a re-read, it becomes obvious that her horrified reaction was due to the fact that she realized Harry had Riddle's diary. So if that's what she was reacting to, the thinking went, maybe she wasn't responsible for the valentine after all. In a 2005 interview, Rowling clarified that Ginny really did send the singing valentine, and that she did so of her own free will.[[note]]Although Riddle wouldn't have been able to control her anyway at that point, seeing how Harry had the diary.[[/note]]

* CreatorsFavoriteEpisode: Creator/DanielRadcliffe has said that this is his favorite book in the series.

** For a few years, fans debated whether Ginny actually sent Harry that singing valentine. On an initial readthrough, it's implied by her behavior, but on a re-read, it becomes obvious that her horrified reaction was due to the fact that she realized Harry had Riddle's diary. So if that's what she was reacting to, the thinking went, maybe she wasn't responsible for the valentine after all. In a 2005 interview, Rowling clarified that Ginny really did send the singing valentine, and that she did so of her own free will.[[note]]Although Riddle wouldn't have been able to control her anyway at that point, seeing how Harry had the diary.[[/note]]

* DeletedScene: Creator/BonnieWright revealed that she filmed a scene in which Ginny strangles roosters outside of Hagrid's hut. In the book, it was revealed that Ginny, under Tom Riddle's influence, killed Hagrid's roosters, since the crow of roosters is fatal to the basilisk. This fact is entirely omitted from the movie, therefore the scene was cut.

* {{Jossed}}: Many people think that Professor Gilderoy Lockhart is a character based on Creator/JKRowling's ex-husband. Rowling has said on her official website that Lockhart is based in an egocentric person that she really dislikes, but he is not her ex-husband.

* CreatorBacklash: A personal letter from David Heyman to Creator/AlanRickman following the production of this movie reveals that the actor was occasionally frustrated with the role. This is not particularly surprising if you remember that Snape has a limited role in this particular movie.

* CreatorBacklash: A personal letter from David Heyman to Alan Rickman following the production of this movie reveals that the actor was occasionally frustrated with the role. This is not particularly surprising if you remember that Snape has a limited role in this particular movie.
* DawsonCasting: As noted above, Christian Coulson was twenty three playing sixteen. Likewise Shirley Henderson, who plays school-age Myrtle, was ''thirty seven''.

* EnforcedMethodActing: In the scene where Harry meets Mr. Weasley and the latter asks him a question about Muggles, Mark Williams ad-libbed a different Muggle object in each take (the final cut's being a rubber duck) so that Creator/DanielRadcliffe would actually be caught off guard by the question.

* PosthumousCredit: Richard Harris, Dumbledore's actor, managed to complete all of his scenes before he succumbed to Hodgkin's disease on 25 October 2002. He is still given a credit in the finished film.
* RecycledSoundtrack: Music/JohnWilliams was only available to compose a few new themes for the film due to an incredibly stacked 2002 schedule (''Film/AttackOfTheClones'', ''Film/MinorityReport'' and ''Film/CatchMeIfYouCan'') and handed off conducting duties to William Ross; consequently, the film heavily reuses the score of [[Film/HarryPotterAndThePhilosophersStone previous film]]. The Quidditch match also incorporates some of the score from the aforementioned ''Attack of the Clones'' (specifically from the Coruscant speeder chase scene).

* LoopingLines: Jamie Waylett and Joshua Herdman play the disguises Ron and Harry respectively take on-set, with Creator/DanielRadcliffe and Creator/RupertGrint re-recording their dialogue during post-production.

** Lucius attempting Avada Kedavra on Harry was ad-libbed by Creator/JasonIsaacs. At this point he had only read the fourth book and that was the only spell he could remember. Additionally Isaacs had to keep his head tiltled back to prevent the long blond hair from falling in front of his face - which helped make Lucius appear even more haughty and snobby. He even improvised kicking Dobby; he lost track of where he was supposed to look during filming, to which Chris Columbus told him to look anywhere and the effects team would put Dobby there. He added in the kick for good measure, and Columbus initially thought he was slipping before Isaacs explained it.

* LoopingLines: Jamie Waylett and Joshua Herdman play the disguises Ron and Harry respectively take on-set, with Creator/DanielRadcliffe and Creator/RupertGrint looping their lines in during post-production.

** Jamie Waylett (Crabbe) and Josh Herdman (Goyle) play the disguises Ron and Harry respectively take after they drink the Polyjuice Potion.

* ActingForTwo: Creator/JasonIsaacs joins the cast as Lucius Malfoy in this film. He also provides the hissing and parseltongue sound effects for the Basilisk.

** Lucius attempting Avada Kedavra on Harry was ad-libbed by Creator/JasonIsaacs. At this point he had only read the fourth book and that was the only spell he could remember. Additionally Isaacs had to keep his head titled back to prevent the long blond hair from falling in front of his face - which helped make Lucius appear even more haughty and snobby. He even improvised kicking Dobby; he lost track of where he was supposed to look during filming, to which Chris Columbus told him to look anywhere and the effects team would put Dobby there. He added in the kick for good measure, and Columbus initially thought he was slipping before Isaacs explained it.