The thing that makes Int. Sub such a genius episode is that although it is absolutely hysterical it's also one of the episodes that best portrays who BoJack ACTUALLY is, and there are a couple of reasons for this:
The struggles he goes through throughout this episode are relatively simple. When it comes down to it, he lost his mum recently, and he wants more than anything to talk about it, but he fundamentally doesn't know how. He's so traumatised that he doesn't know how to healthily reach out to people, and this trauma manifests itself in a way that is low stakes enough to be digestible. Sure, this later becomes something much bigger with his conflict with Diane, but fundamentally it represents both how layered he is as a character (he has terrible problems with communication that we largely saw unpacked one episode prior) and how far he still has to go: he doesn't want to improve enough that he can actually tackle this head on.
This episode isn't from Bojack's perspective! It's texturally from Dr Indira's, but on a deeper level this is Diane's journey!!! Diane is the one who has to deal with the consequences of this. Diane is the one who wants to talk to BoJack more than anything, but his trauma is preventing her from doing so. And it's brilliant, because this is exactly where Diane's ideologies lie. At the end of S1, Diane makes a point about how people are fundamentally their actions, and that the deep down doesn't matter.
To portray BoJack from Diane's perspective, showing how his trauma damages their relationship, is a genius move, and is one of the best portrayals of BoJack this show gives us.
