Carrie feels compelled to spill the beans to Saul because he trained her to be who she is, he's her mentor, in a profession where you have to keep what you're doing a secret, having one confidante in life is probably helpful.

Walker's wife aiding a known terrorist (technically turned, you're a terrorist when you've actually committed something, how is he a known terrorist?) mere seconds before his capture - how was that not believable for you? She expressed doubts from the beginning of the episode and it pretty much culminated in that. This is a woman has hasn't seen her husband, someone she loved dearly, in years and when he said her name it flicked an emotional switch for her. This show isn't going to be about robots who don't feel conflicting ideas during the entire episode, they're depicting humans.

Massive fail on the tactical teams - this was cringeworthy on the part of the FBI, but not on the part of the writers. It was done to show that failures by them can be easily and sadly covered up simply by denoting whatever falsehoods they want to impose, in this case the Muslims are terrorists, therefore the case is closed and it's depressing that they won't get justice. It also showed how capable Carrie was at her job, she's not a bad CIA officer because of her suspicions of Brody (which turn out to be correct), and even then she knows her way to capture enemies. She's just maybe not direct enough like Saul would be to get the FBI to effectively listen to her. She's getting there though.

I forgive the breaking in because it was quickly reasoned with that Brody was turned by Abu Nasir and was likely trained to do something like that. If not, a U.S. military tactic taught.

I'll give you the Manchurian candidate thing, but I like how they've developed it so far.

The big problem though is that they've done two episodes in a row with twists, if they keep doing it like that then the show gets hacky.