*Dumbledore's office, a quiet retreat and study for the sage Headmaster, was located in one of the highest towers of Hogwarts. Dumbledore's fascination with the universe and the skies became the room's defining feature.
*One of the most expensive props in the film was the working telescope in Dumbledore's office which was rarely seen on screen.
*On the shelves in Dumbledore's office are hundreds of books, many of which are actually old phonebooks covered in leather and dust.
Gryffindor common room
*The Gryffindor common room and the boys' dormitory were actually built as two connected sets. The staircase spirals up to a hallway that in one direction led to the boys' dormitory set. In the other direction a doorway simply drops off into nowhere.