HBO has thrown out one of the Harry Potter movies' biggest rules, but other casting controversies prove this is the least of the TV remake's problems. We all knew that re-adapting the Harry Potter series was going to be tricky. This is a beloved franchise, and messing with the way audiences see these stories and their characters will certainly invite backlash. Add in the controversy surrounding author JK Rowling, and it's clear that the Harry Potter remake can't avoid negative buzz. Now that HBO has announced its first round of casting, we are seeing this firsthand.