I hate it when people accuse Teresa or Jane of being Red John -- I'm not about to do that here. But there was something peculiar about Lisbon in the final episode of season 5 that caught my attention and kept it. 

Question: Why does Lisbon have a cast on her arm in Red John's Rules? Oddly, she does not have it in Desert Rose, which picks up immediately where the previous episode, mentioned above, left off. 

Theory: Robin Tunney broke her arm. The director said, "Let's go with it, but when Patrick asks you what happened say 'I just slipped and fell' in an awkward high-piched voice and do that shifty-eye-thing Lisbon does, as if she's trying to hide something, so that the viewers will question it."

Any better ideas?