Colonel Green

Unless the next episode starts right where this left off (unlikely), they're skipping over a ton of reactions to stuff that I would have thought they would have shown (even if, in a lot of cases, we didn't actually "see" them in the books). In King's Landing alone, it didn't look like Jaime or Brienne heard about the Red Wedding, we only got a brief snippet of Sansa's, no reaction from J/B to learning about Sansa's marriage, nothing from anybody but Cersei about Jaime's hand, none of the KL crew's reactions to Brienne's existence, etc.

A lot of the minor Lannisters have been absent this year (Lancel, Tommen, Kevan), no doubt to make room for the Tyrells.

They haven't aged all the characters equally. Natalie Dormer is young-looking, but it's difficult to believe that character isn't at least in her early twenties.

In the books. There's no date for when it happened in the show, and moving the date doesn't really change anything.

That's why you establish why she did it, and why it's a strong, defiant moment for her. Some people will still not understand, of course, because there were any number of sexist idiots who thought she was just being mean to her forced-husband in the books.

No, they deliberately chose to strip away all the context for her doing it, particularly by having her find out much earlier, and removing or minimizing all the reasons she was justly uncomfortable with Tyrion.

He was just following orders!

Now that the episode has aired, I can say that, in my opinion, they quite blatantly chickened out on the entire Sansa/Tyrion story. There were obvious production reasons why it wasn't going to be exactly like the books, but essentially every creative choice they made in relation to it was aimed at sanding all the rough edges off it so that none of the major actors (apart from the show's go-to asshole, Joffrey, and I guess Tywin) would come off looking bad. In the process, they reduced one of the most harrowing parts of the third book to a limp noodle, dramatically. Tyrion was her least-cruel jailer, but he was her jailer nonetheless.

I've seen people speculating this, but that's just really implausible to me. They've been walking for over half a season at this point, and Theon couldn't find them even when the trial was much fresher.

The writers have said in the past that it's going to be primarily book 3. Most of the characters' endings in book 3 are pitch perfect for the end of a season.

His mother (who has experience in that regard), his wife, any other bannerman he picked for that task. No reason whatsoever for him to need Jon for that. Seeing as his wife is not pregnant and he's about to go on campaign, there's no reason for him to worry about that before heading off North and leaving Jeyne behind in the books.

If he conceived a child, he would just make a new will. The baby not being born yet wouldn't matter. The child would still be the heir.

But he hadn't, by that point, and was about to embark on a major, doomed campaign. Here he's got what he feels is a strategic masterstroke brewing (albeit a somewhat desperate one), and his wife is pregnant. There's no real urgency to take a pretty unprecedented action with regard to Jon.

Robb has any number of other people who could do that, most notably his mother. There's no need for Jon.

They worked almost the entire cast and every location into this episode, which was impressive, but also makes for diffuse screentime.

If Robb has an heir on the way, he has no need to designate somebody in lieu of Sansa.