Revealing mistake: The spiders advancing on Harry and Ron during the visit to Aragog are not the same in appearance. In some of the closeups a few have elongated bodies, while others are medium-sized. And many of them look quite aged, like Aragog himself.
Harry Potter and the Chamber of Secrets (2002)
41 revealing mistakes
Directed by: Chris Columbus
Starring: Maggie Smith, Alan Rickman, Kenneth Branagh, Richard Harris, Daniel Radcliffe, Jason Isaacs, Emma Watson, Robbie Coltrane, Tom Felton, Rupert Grint, Richard Griffiths
Genres: Adventure, Family, Fantasy, Harry Potter, Mystery
Revealing mistake: Mrs. Weasley might as well knit like a muggle because she's not making any progress with magical knitting. In the Weasley's home and we see the magic knitting, the needle shoves into the hole, but no thread loops around and it is not advancing. The amount that has already been knitted is magic indeed since all the motion shown in the film produces no results. (00:11:25)
Uncle Vernon: And Dudley, you will be?
Dudley Dursley: I'll be waiting to open the door.
Uncle Vernon: Excellent. And you?
Harry: I'll be in my bedroom, making no noise and pretending that I don't exist.
Trivia: When Hagrid is welcomed back to Hogwarts and everyone stands up and applauds, Vincent Crabbe also stands up and starts to applaud as well. This wasn't in the script and Tom Felton, staying in character, quickly grabbed Jamie and pulled him back down.
Question: Is this true that line "I didn't know you could read" was improvised by Tom Felton, who forgot his original line?
Answer: Yes in the same way Daniel Radcliffe improvised his line about always being around when talking to Lucius at the end.
Actually, Jason Isaacs said that, and he and Daniel didn't forget their lines but did it intentionally.
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Answer: Yes. It's a common occurrence in a lot of movies for actors to forget their original lines so they improvise something to help move the scene along and not break character. Tom did this because he forgot what his original line was.