Reporter Noel De Souza, who is friends with Potter 3 director Alfonso Cuarón, visited him on the set of the film and was nice enough to write a little article to share observations with the rest of us muggles:
The sets themselves are amazingly real, enormous and done with painstaking detailing. I walked into the great hall not believing it was a set but a real structure from an ancient past.
David Thewlis, who plays Remus Lupin, the new Defense Against the Darks Arts teacher, tells me: "The difference between this film and the two other Harry Potter films will be very apparent even to the untrained eye. Just the way it's being shot, the director is using extremely wide lenses on extremely close shots and the camera is moving in quite extraordinary ways."