>>93886713The show pretty much never has long-term consequences except for the Lich, but it usually has it's short-term consequences last more than a single episode. I mean, the heroes didn't even solve the problem, the problem just fizzed out of existence. Like it stopped wanting to be around anymore and walked itself off the show.
...Also, now that you pointed it out, it really is ridiculous how little involvement Fern had. He came into live as a Finn clone, had a bit about trying to adjust to life, then decided to be evil and died right after. Man, the writers REALLY don't like long-term change!