Fans of the Harry Potter books who saw the movie adaptations found that there were a few plot points that the films either didn't explain, didn't capture fully or just flat out ignored. WatchMojo presents the Top 10 Biggest differences between the Harry Potter books and their movie counterparts. But what will take the top spot on our list? The story behind Voldemort's Parents, missing characters like Charlie Weasely, Teddy Lupin and Peeves, or the complete absence of St. Mungo's hospital? Watch to find out!