Character drops, lore drops, brilliant action, stunts, politics, great sfx, even more stunning sets. The detail that has gone into the characterisation, the costumes and set design is breathtaking, there are so many details for book fans to appreciate. There was a particular fight scene that was one of the best of its kind I've ever seen, beautifully shot and believable, not at all cheesy while keeping a sense of lightness befitting of the situation and characters involved.
When the episode finished I was amazed and sad to find it had already been that long, but what a cliffhanger to end on. Setting up for an incredible last three episodes!