Glad you liked the twist ending Lief. The fact that anyone can die is one of the reasons the books are so exciting. You actually feel nervous because your favourite character might actually end up dead. Of course I was furious in book three when my favourite character was killed and put the book down for like three hours, before I had forgiven Martin. But that kind of emotion is what's great about Asoiaf.
As for episode 9 I'm disappointed we didn't get to see anything from the battle of the Green Fork or the Battle of the Whispering Woods, I was counting on some good action. Oh well, we'll have the Battle of the Blackwater next season. Otherwise a great episode.
True. Though there were other characters who were not officially cast but appeared on screen anyway (Rickard Karstark, Maege Mormont, maybe some others I'm forgetting. Wouldn't be that hard to have Margaery hidden in a wedding veil for the episode and then have someone totally different actually play her next season. It's a stretch, though.
I'm guessing we won't see Riverrun until next season either unfortunatley, as Edmure neither has been cast. A pity. I guess they could go with a veil for Margeary, intresting theory, but I think it's unlikly.