I for one am disappointed that this joke didn't make it in the episode:
https://instagram.com/p/2by…

The hermit might be a reference to the Tarot card of the same name, who's often depicted on top of a mountain… The Hermit card can (according to my rudimentary knowledge of Tarot) represent the pinnacle of personal attainment, reflected in this episode's hermit's promise of turning you into the person you always…

There's one shot of the Ice King's skeleton with the crown still on its head, even though Finn had the crown at that point in the episode. This episode fixes that by having Prismo cut the crown from Farmworld Finn's head in the present and paste it on to Ice King's skeleton in the past, thus explaining the two crowns.…

So was Lich Jake basically Ice Finn's Gunter? I guess the Ice King's companion being a malevolent super-being in the body of a cute animal is a universal constant.

You don't have to be involved in the show's development to know this, just have a basic understanding of how cartoons are made. It's a pretty common thing I see among people who are into the nitty gritty of pop culture, assigning some godlike authorial credit to the title of showrunner. In AT's case almost more than…