My thoughts:
I loved the meeting at the beginning. So many stare downs. Really transferred the tension to the viewer. To be honest I was expecting the Hound to kick over the box containing the zombie and it would be a pile of dust.
I both loathe and love Cersei at the same time. She is such an awesome character. I felt a little flat when she appeared to become compliant with the alliance of the living. I was so happy when she revealed her ruse to Jaime. He spat the dummy big time and looks like he's off to Winterfell to join his brother. Convinces us even further that he will be the one to end Cersei. That will happen after she reveals the child she carries belongs to Euron Greyjoy and not him.
Back to Tyrion and I'm smelling a rat. They made a point of showing him linger in the hallway after Jon Snow/Sand/Targaryen when to visit Dany for some nocturnal shenanigans on the Love Boat. At first I thought he was thinking "dammit, now I'm the only one who hasn't seen her tits". Thinking about it further we never heard how he convinced Cersei to agree to join team Targaryen against the zombies. The contents of that private meeting remain undisclosed. Has he conspired with her? He might see it as his best chance of becoming the legitimate Lord of Casterly Rock as is his birthright. Could be the major twist/betrayal of the final series.
Best line of the episode belongs to Sam.
Bran at his emotionless best: "I'm the three eyed raven now"
Sam with a knowledgeably big smile: "Thats great.........I don't know what that is"
I LOL'd. He delivered that perfectly.
They then go on to collaborate with their intel to reveal what the audience already knew. That Jon Snow is a Targaryen and legitimate heir to the Iron Throne. The new info we got was his name is Aegon. That would make him King Aegon VI if/when he assumes that role. Question is how with Dany react when she finds out? Not that she just **** her nephew. That's pretty tame by Targaryen standards. More that she's spent years single mindedly working towards reclaiming what she believed her birthright. What will she do when she finds out her claim is now longer valid? Will she bend the knee to her nephew (in fealty that is, not in the bedroom).
I suspected (or maybe hoped) that Arya and Sansa were playing Littlefinger all along. Turned out to be 100% true. They let him paint himself well and truly in the corner before they played their hand. Once revealed they were prepared to counter any defense he could offer. Arya's cold and brutally quick slash of the throat was a thing of beauty. Such an awesome death combined with public humiliation of the man who had been playing games with the entire continent at his will. While I rejoice in his passing I am also somewhat saddened by it. Much like Ramsay he was one of those bad guys you love to hate and part of you wants to see them endure purely for the entertainment they bring.
The final scene was not unexpected but by the same extent it was fantastic. Brilliant way to set up the final season.
About the only part of this episode I can be critical of is Theon's recruitment exercise on the beach. Conceptually it was fine. I just didn't find it convincing in its portrayal. Maybe some lazy directing/editing there. A bit if "yeah, thats good enough. Not that important anyway".
Overall it was the best episode of the season and up there with the the best in the entire series.