'Harry Potter' stars will grow on you
HOLLYWOOD-- Having a core cast of young actors creates logistical problems for any movie -- minors can film only four hours a day. Using the same core cast of young actors for a series of films adds another twist -- biology.
When plans for the first Harry Potter movie, "Harry Potter and the Sorcerer's Stone," were announced, the idea was that there would be a film a year until the series was completed and the cast would age along with the characters dreamed up in J.K. Rowling's books. So it isn't all that surprising to find that Ron and Harry have deeper voices in the second film, or that Hermione's face is not quite as round.