Bob Calder, the author of the recently released book Harry Potter Page to Screen: The Complete Filmmaking Journey recently shared his experiences on going behind-the-scenes of the 'Harry Potter' film sets.
When asked about the biggest challenge the creative team faced:
"I think the biggest challenge the filmmakers faced over the eight films was allowing the films to grow up in the same way the books had done. Rowling's great achievement for me was writing a series of books that allowed her readers to grow with them - you could read the first one at the age of ten and you'd still be there at 18 to see how it all ended, which is unique. But also something of a gamble.
The movies had to allow for the fact that the final film was going to be a lot tougher and darker than the first. There's always a tendency in movies to try and not lose your audience, but in a way the 'Potter' movies had to grow. You can watch any of the Star Wars movies at any age - but I wouldn't let an eight year old watch the last couple of Potters. That was a brave move and, of course, the right thing to do."
You can read the entire interview right here.