Most radically, there was the show’s obsessive circling around its accumulated past, whose visual summary might be the whiteboards in one of the final episodes (“Sunk Cost and All That”) on which BoJack, together with Todd, Diane, and Princess Carolyn, tries to list all his many crimes and misdemeanors. That kind of unruly frame-breaking isn’t necessarily something you might associate with poignancy or sincerity. But it was this continued backtracking attention to its own making that finally allowed BoJack Horseman to end up showing that cartoon might be the most truthful model of our landscape. A person, you might conclude, is also an outline infested by other selves, a vehicle for mournful self-criticism and recomposition. We’re all fantastical now, it seemed to argue, in the multicolored digital light.