DID YOU SEE THE NEW EPISODE?!? What does it mean? Where did the portal leading to an alternate dimention come from?! What's with the purple stuff?! Did the sea lard secretly orchestrate this whole thing? Ahhhh!!! #FANBOYPOWERWORKSBETTERTHENCOFFEE
Nah, the whole "weird animation" thing reminded me a lot of the AT Pilot (you can find more informations about here : adventuretime.wikia.com/wiki/Pilot ) It was kinda the same Jake in that episode
Besides, in the new episode there is a scene where Finn & Jake tried to tell their name, but said it badly (Jake called Finn "Fake" and Finn called Jake "Pen") or otherwise, Pen & Jake, Pen is the name of Finn in the pilot (but Jake have the same name), so I bet there's more informations that I didn't found !