1. It's one thing to be timely/topical, but doing an episode about bombing Wall Street protesters seems inappropriate to me, especially after having so recently done a big two-part episode about an international terrorist plot. I mean, just think, writers and producers of Castle: if a bomb WERE to go off on Wall Street sometime in the near future (God forbid) imagine how horrible you would feel about this episode.
2. Lately a lot of commentators have been complaining about the Castle/Beckett relationship moving too slowly, whereas you know that if the relationship started developing more quickly these same people would be like, "Noooo, you developed the relationship too quickly! Now they're together and it's not fun to watch anymore!" Speaking for myself, I really have a lot of respect for the way the writers have managed to keep things moving slowly but steadily forward without losing the push/pull tension of the relationship.
With that said, I have to admit that I find it a little contrived that Castle wouldn't call Beckett out on lying to him. Maybe I'm wrong, maybe I'm just projecting my own values onto him but it seems to me that a man who was finally willing to lay all his cards on the table and profess his feelings would want to confront her and ask her why she has avoided the issue for so long. Let's face it: she has broken his trust and he believes that she doesn't love him, so at this point, what does he have to lose?
3. Nevertheless, it's really interesting to see Castle as the wounded party. That happened in the season premiere too, and it has really changed the balance of power in their relationship, so it'll be interesting to see how that will play out when it does come to a confrontation. Also, since he has also been keeping a fairly large secret from her, it will be interesting to see if she finds out about that before it comes to (verbal) blows and how effectively she uses that to try to regain some high ground.
It's also interesting to see Castle acting selflessly for once, contributing his talents to the precinct without any motivation for personal gain, working purely for the cause of justice. (Come to think of it, it sounds kind of like a superhero origin story, but they already did that plotline this season.) His character arc over the course of three and a half seasons has been really beautifully developed and I'm so excited to see how it continues. Moreover, as far as I'm concerned, Castle is sooooo much sexier when he is sincere, so the more sincere!Castle, the better, I say!