Harry Potter: 9 Obscure Movie Secrets That Took Years To Discover
2. Rickman Had A Soft Spot For Snape
Alan Rickman was informed of his character's loyalties right from the start. When the actor was cast as Snape, J.K Rowling told him about his love for Lily and that no one else knew.
As he was the only one to know this very important piece of information, he would often reject direction from the directors on set. He could also not let anyone in on the secret but it was all made clear when his broken heart was revealed in The Deathly Hallows.
Many on set thought he was simply embodying his character sass when the cameras weren't rolling but it turns out he had good reason for being as stubborn as he was about his character. David Hayman, the producer of the Harry Potter film series, claimed that there were multiple times Rickman refused to do as he was told and that it all made sense when the reveal happened.
Alan Rickman is another good example of excellent casting. Rickman understood the assignment and kept this major secret until the end, adding to the impact on everyone involved and everyone watching.