If I recall, the reveal if Jon Aryn's true killer was pretty much the same in the book. I was ok with Littlefinger killing Lisa then too.
I didn't recall this at all. Maybe I'm being daft (I read the majority of the books in a three week delirium while suffering from a nasty flu), but I never thought Littlefinger convinced Lyssa to poison her husband and B.S. the letter to Cat. I always thought it was one of Cersei or Jaimee's servants who did it to protect their incest, and Littlefinger just made the most of the opportunity by trying to frame Tyrion and later marrying Lyssa.
Anyone else read that as well? Or was I really that hopped up on Dayquil and missed the whole thing...?
When I read what they did in the episode last night, I thought, yep, another wild divergence from the books.