Like lvan l have now watched it twice.
The Ramsay Bolton line to Sansa, that he is now part of her, l don't believe is about a pregnancy, but that he has managed to get inside her head, and turn her into someone a bit like him. The way she dispatches him supports that, and the little smirk she gives as she walks away to the sound of his screams appears to confirm this. Sansa predicted Ramsay would draw Jon into a trap, and he fell for it. That adds a little more poignancy to Bolton's rebuff of Jon's challenge, "He's good," with the implication that l am better, because Snow will react and fall into his trap.
Was there a plot hole? When Sansa releases the dogs, she says to Bolton how in his own words they hadn't been fed for 7 days. The only problem with that was, she rode off from the challenge before he said, she never heard him say those words. Someone could have told her later, but she wasn't there to hear him say it.
The horses charging towards Jon on the open plain is for me the single most enduring image of the entire series, not just this season. That was a shot of such epic proportions, that l was transfixed, and watched in absolute awe. The perspective was one l haven't recalled from any other show like that. l must see it again, on a big screen.
And so to the last episode. What will be the twist. Usually it is the death of significant character. One of the local 'Throners' a girl in the office here thinks it will be the death of the young king, to fulfill the prophecy about Cersei. l have put on a little bet, that it won't be him. From the look on the face of Ser Davros, l think it will be the Red Witch, Melissandre.