I enjoyed the episode. My big takeaway was that it appears that HBO may know the endgame for each of the main characters, but they have no idea what happens between the end of book 5 and the very end of book 7. What happened last night with Brienne, Sansa, Littlefinger, Jaime, and Bronn appears to be very divergent from what has happened/will happen in the books. We know that when Book 5 ended, Brienne and Jaime were together, in the Riverlands, on their way to Lady Stoneheart, and Sansa/Littlefinger were still in the Vale rather than on a mysterious road trip to help Sansa get revenge on the people who have wronged the Stark family. Bronn was happily married to Lollys Stokeworth and reluctant to leave his new castle.
For me, this was a good sign. I was worried that HBO was going to spoil book 6 for me, but now I am not so worried. Of course Book 7 is bigger issue.
The one thing, from last night, that I felt might be a spoiler was revealing that the man in the House of Black and White was Jaquen H'Gar. That may turn out to be accurate, or may be HBO's own addition. I have always suspected that Syrio, Jaquen and The House of B/W man were the same person changing faces and watching over Arya, but there are some reasons to doubt that this is accurate.