I found out that the Arryn Moon Door was actually a hatch with doors on, not a big hole in the floor. It was satisfying when Lysa fell through it though.
A lot of the things happening in each book are taking place at the same time as others in a previous or next book. A TV show converges the timeline because a. it can and b. it has to, otherwise it's boring.
Also George RR Martin has given them the info of what's going to happen in the future books because the show is going faster than his writing. So you might be seeing things from future books. shrugs
Well not last night because it is a girl called Jene Poole who is married to Ramsey Bolton (she's a fake Aria) and Sansa in the books is nowhere near there