Comedy loves a good callback. In this regard “Hacks” rewards viewers who listen keenly to every bit of wisdom its comedy legend Deborah Vance (Jean Smart) shares with comedy writer Ava Daniels (Hannah Einbinder). Every moment in its third season finale “Bulletproof” was set up by previous episodes. Seeing the sock-in-the-jaw closer before it hit, however, required remembering a line Deborah shares with Ava in the second season’s final episode.
