Through 3 episodes: The book was not very clear, but for the show jaqen h'ghar is still around - plays a familiar role from the book. Arya story line progresses as you would expect.
Jamie and Bron take off for Dorn to rescue Myrcella.
Littlefinger delivers Sansa to Bolton to marry Ramsey - some kind of deal going on. Sansa seems to be OK with it

Reek is around, and trying not to be noticed.
Tyrion is captured by Mormont.
Snow wins election - quickly - then chops off Slynt's head the next episode.
The ground work for Cersei's downfall is well underway. High Sparrow comes to power in episode 4