I think the plotlines in the first two books were much simpler, and the show is struggling to keep viewers informed on so many different stories going on at the same time. They are already cutting plots by week, we didn't see any Theon (thankfully), Jon or Robb. This is the first time we've seen Sam in quite awhile. I think they're worried that if they go half a season without a character, viewers will forget who they are when they show them again.
It will be interesting to see what they do with books 4 and 5, because the plot certainly doesn't get any simpler.
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