The Harry Potter movies are beloved for a reason, but they feature some surprising mistakes only longtime book fans may catch ...

The Harry Potter films are a fantasy series based on the series of seven Harry Potter novels by British writer J. K. Rowling.

Since the later Harry Potter films left the Dursleys out, many fans don't know about a few key moments from the books.

The legendary thespian was offered the role of the iconic Hogwarts headmaster - but decided he 'couldn't do it'.