Out of all the episodes this week, this one surprised me the most because it went in a direction that I really wasn't expecting. It was fresh, creative and original, and I look forward to more episodes being like this one in the future.
Even the Karen and Plankton interactions were funny, so I'm enjoying their dynamic again. Focusing on Sandy teaming up with Karen was great, and they really worked well together. Patrick's skateboard gag was hilarious. And I love the message that there's no automatic cure for being dumb, and that Sandy and Karen spent an entire semester painstakingly educating everyone to get them back to their normal selves. I believe the irony was intentional in that everyone graduated from college EXCEPT Plankton. Seeing everyone in their togas was really sweet, in a way. I got the fuzzies from them graduating.
I only have 2 issues with this episode:
1) As it's a Krabs vs Plankton episode, the ending is always predictable in that regard. I would've loved more scenes leading up to graduation instead, and dropping the typical krabby patty formula shenanigans. They could've spent more time showing everyone's dynamic at University. We only get a hint of it with the part where Plankton bullies Spongebob and Mr. Krabs, and Patrick as the janitor (which was funny, but in a way, sad).
2) Too much random focus on the townspeople being dumb, and not much main character interaction. I feel like the main characters should've easily filled the slots of the townspeople in the classroom. We don't see dumb!Patrick interacting with dumb!Spongebob, or dumb!Spongebob interacting with dumb!Squidward. Everyone seemed very separate from one another.