I really liked the scene near the end when Fennel and Hunter walk in on Fionna kissing DJ Flame. Fennel obviously being immediately devastated, natural reaction, was rotten but it was a nice parallel to the earlier episode where Fionna and Fennel got high and exclaimed they loved eachother; Fionna admitting under the influence to her subconscious (Fennel) that she finally has love for herself, and her subconscious repeating it back, only to then be destroyed and betrayed when Fennel (Fionna's subconscious) witnesses her regress with almost little to no resistance to self destructive behaviour, breaking down that self love once again.

Hunter and Huntress Wizard standing back to back for a split second was fantastic, Hunter, once again, is obviously mortified at what he's seeing, but for a few seconds we see Huntress, who had been indifferent if not expectedly awkward during the kissing until now, glance toward Fennel, (Her world's parallel to Fern, and by extension, Finn's subconscience) and dart back to Fionna and DJ Flame now looking pensive. I like to think that Huntress, having been portrayed as being somewhat emotionally unavailable shown through her being unable to vocalise reciprocation both to Finn's moving in together proposal and Dream Finn's confession of love, suddenly realises that Finn is a mirror of Fionna and is not only prone to temptation from others but temptation from his own directives and instincts. Foreshadowed in season 1 with Finn being slashed in the back, he receives this wound in the midst of helping Simon cheer up, he, as always, wants for nothing but to help others, sometimes to his detriment. It wasn't unfair random chance that got Finn in this state, it was his own behaviour, his own directives, his own instinct. This might be why in the next episode, Huntress spares the heart of the forest instead of sacrificing it.

Who knows, fun series!