Where’s The Buck Teeth
In the books, Hermione had buck teeth, but not in the movies because Emma Watson struggled to talk with the false teeth in her mouth. Since Emma Watson couldn’t talk with the fake teeth, Hermione didn’t have them in the film.
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They Changed Child Labor Laws
To accommodate filming, the British film industry changed child labor laws. The production was reduced to four hours of shooting a day and a minimum of three extra hours devoted to schoolwork with a cast of ten and eleven-year-olds. Child labour rules were modified in the United Kingdom to introduce a couple of extra working hours to the week and to allow on-set lessons more versatile.