When you look solely at the Harry Potter film series, McGonagall is a small but instrumental part of the story - and she's one of the most inspiring and supportive witches that Harry has in his life. If you compare McGonagall's role in the films to her role in the books, however, it's clear that a lot was left out of the cinematic adaptations. For our latest post on The Blog That Must Not Be Named, we’re ranking five details that only fans of the books will know about Minerva McGonagall.