The line about Sam and Dean going to the Grand Canyon when they were little threw me off. Dean explicitly said in season 3 that he's never been to the Grand Canyon. Of course I'm probably making a bigger deal about of this than I should be but

More importantly, I wasn't sure about Naomi talking about Cas' past rebellions. She mentioned the "crack in his chassis" (or whatever the line was), how he's fundamentally different from the other angels, and that no matter how many times he's been reprogrammed, he's always tended to side with humanity. But I thought that it was the Winchesters (mainly Dean) who influenced him to rebel and side with humanity - wasn't that his entire story arc of seasons 4 and 5?

Also getting really tired of how Dean yet again was delegated to caretaking for Sam. That's been the majority of his "story" this season.

Other than that I enjoyed it! I liked Metatron and thought the story on the archangels and his leaving of Heaven was really interesting. I liked how he asked Dean whether he was sure he wanted to close the gates of Hell, if he had thought about the consequences, etc. It's an interesting question.

And a lot of other aspects of the episode. Crowley and his "directing" (it seemed so much like Crowley to do that, more like the Crowley from previous seasons than this season's Crowley has been), Kevin figuring out about fake!Dean and fake!Sam (Crowley: they were "too polite?" ), Cas using the Biggerson's restaurants to evade the angels (I loved the little reference to physics and superpositions as the way Cas was hiding yay physics!), and Dean and Sam really looking like they're brothers again.