Not long after Alan Rickman started to play Severus Snape in the first Potter movie (released in 2001), J.K. Rowling told Rickman some character secrets about Snape that would not be otherwise revealed until the last book. Most significantly, for over seven years, Rickman was one of the very few people other than Rowling to know (years ahead of the last book's publication) that Snape had been in love with Lily Evans (later Potter) when they were students at Hogwarts, and both Snape's protection of and antagonism toward Harry came from that. Rowling said that she shared this information with Rickman because "he needed to understand, I think, and does completely understand and did completely understand where this bitterness towards this boy, who's living proof of [Lily's] preference for another man, came from."
Rickman, after Rowling told him, was saying to the other actors that he knew something about the plot that they didn't.
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Facts about Harry Potter that you didn't know
RandomIn this book you'll finds some facts about Harry Potter characters that you probably didn't know. Enjoy! Disclaimer: I own nothing
