Tom Marvolo Riddle: Haven't I told you? Killing Mudbloods doesn't matter to me any more. For many months now, my new target has been you.
In his study, Dumbledore speaks to Lucius Malfoy and holds up the skewered diary for Malfoy to see. When Dumbledore puts the diary down in this shot as Dobby tugs on Harry's sleeve the moving black wire between Dobby and Malfoy on Dobby's left is visible on the bottom of the screen. This wire was attached to Harry's sleeve to make it move and though the wire between Dobby and Harry was edited out, the other end was not. (Visible on fullscreen DVD.) See more...
There is an extra scene after the credits. You see the after affect of Lockharts backfire of the 'Obliviate' spell. See more...
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Harry Potter and the Chamber of Secrets (2002) - 1 easter egg
Directed by Chris Columbus, starring Alan Rickman, Daniel Radcliffe, Emma Watson, Jason Isaacs, Kenneth Branagh, Maggie Smith, Richard Griffiths, Richard Harris, Robbie Coltrane, Rupert Grint, Tom Felton (add more)
Easter eggs are hidden bits on DVDs which if you know where to look can provide all sorts of fun extras.