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they could have used a lot more time to lay out the littlefinger thing - given the rushed exposition i feel like they didn't answer some key questions about when sansa knew, when bran clued her in (because he must have, right... she knew about lysa arryn directly but had no way of knowing all the original KL / ned's death stuff)... and when / if arya was in the loop as well. the way they all ganged up on him at the end certainly made it seem like they had a chance to pregame it. but as it stands, though i think there are reasonable character-driven explanations for the whole sequence of events, it definitely felt rushed.
Theres no way for the Baelish storyline to make sense, they wrote themselves into a corner. You'd have to be Shakespeare to write your way out. Its probably the best anyone can do given what they were working with in s7
Think about it from Peters POV, you are lord of the riverlands and lord protector of the veil, you own 1/5 of westeros and a 30k+ army under your command. And you march most of this army into Winterfel and give up all your power for????? This is littlefinger who survived and thrived 20 years in kings landing. Writing him as a complete dumbass will never make any sense.