Well, that’s probably the most deviations from the books’ plot in a single episode of Game of Thrones.
Now, I’m not saying that’s bad. In general I’ve been fairly satisfied with the changes to the story (with one admittedly very subjective exception). It is an adaptation, and those books are long, the plot is very complicated, and in general I think the changes have been understandable and have made for a better TV series than if it had remained unchanged.
But seeing as there were quite a few changes, I thought it’d be interesting to dissect them. (Needless to say, spoilers! Although I do try to be vague about book stuff).