As we've covered before, Alan Rickman wasn't always a huge fan of the "Harry Potter" movies he spent over a decade starring in. He didn't like John Williams' score, he thought the younger co-stars weren't always that good at acting, and was often frustrated by the directors' decisions. It was only because J.K. Rowling decided to let the actor in on Snape's backstory early on, before it was revealed in the books, that kept Rickman motivated to see the whole series through.
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