When you're making movies as big and ambitious as the Harry Potter series, there's bound to be a few mistakes, right?
Well, you won't be left disappointed because here's six of the biggest ones we've spotted on the many MANY times we've watched and re-watched the films.
There's a snake who seems to have powers that can't be explained away as magic, a few rogue pairs of shoes and one whole cameraman who seems to have forgotten that he's meant to be unseen!
And Ron Weasley seems to have the power to not only change his hair in seconds but to also change into a whole different person at one point. Not so magical after all!