"Rarely do outside of school remedies work their way into the fabric of the schools or into the teachers lives, and more rarely into the classrooms. Therefore they only offer a modest hope of influencing the basic culture of the school"

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How do you remember everything from different books when you are still writing the HP series? As obsessive fans will tell you, I do slip up! Several classrooms move floors mysteriously between books and these are the least serious continuity errors! Most of the fansites will point you in the direction of my mistakes. But the essentials remain consistent from book to book because the story has been plotted for a long time and it is clear in my mind.

— J. K. Rowling