Mmmkay, I don't mean to be a stickler but I totally found a typo in my copy of Harry Potter and The Chamber of Secrets, Chapter 16: The Chamber of Secrets, Page 283..
"Professorr McGonagall restored it with a wave of her own wand, and turned, frowning, to Seamus."
Pretty sure both England AND the United States spell PROFESSOR with one "R" at the end.
(Another new entry below...how's that for service?)
