The script originally said that Hermione would hug Harry and Ron in the final scene. Because Emma Watson was embarrassed about having to hug them in front of the entire cast, Chris Columbus changed the scene. Hermione just hugs Harry, and starts to hug Ron, but the two get embarrassed and shake hands instead.
Daniel Radcliffe has said that Harry Potter and the Chamber of Secrets is his favorite book.
'Grant, Hugh' was originally cast as Gilderoy Lockhart but was forced to withdraw at the last moment because of scheduling conflicts. Alan Cumming was also considered.
Zoe Wanamaker does not appear in this film as Hogwarts' flying instructor, Madam Hooch. Her character was written out.
Daniel Radcliffe was initially only offered £125,000 (approximately US$181,500) to film Harry Potter and the Chamber of Secrets. The Actor's Union Equity stepped in, however, and negotiated new terms that increased his salary to roughly £2,000,000 (US$3,000,000).
Many Harry Potter fans went to see Scooby-Doo (2002) just to see a Harry Potter and the Chamber of Secrets trailer.
Christian Coulson landed the role as Tom Riddle, even though he was 23 and exceeded the 15-17 age group set for auditions.
Fourteen Ford Anglias were destroyed to create the scene where Harry and Ron crash into the Womping Willow.
As Hagrid is taking Harry away from Knockturn Alley, we see, in one of the shop windows in the background, an entire set of Harry Potter books.
The "Let's just hope Mr. Potter will always be around to save the day" dialogue (see quotes) was improvised by Radcliffe and Isaacs.
During the shoot, the part of Dobby was played by an orange ball on a stick (he was added digitally later, of course).
The train station interior used in the film is Kings Cross in North London, whereas the exterior shot is actually St Pancras. The two stations are adjacent to one another, but not the same building. This was done because the architecture of St Pancras is much more visually appealing.
As Harry enters Prof. Dumbledore's study, a portrait of Gandalf the Grey is included in the collection of the great wizard paintings. It is above the doorframe and slightly to Harry's right.
Filming began three days after the release of Harry Potter and the Sorcerer's Stone (2001).
To get a sense of how nasty his character should be, Jason Isaacs had to go back and watch Tom Felton's performance in Harry Potter and the Sorcerer's Stone (2001).
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