These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: China, IL
Ear Worm: Baby Cakes' rap battle against the Dream Reamer.
The Super Brothers song from "Frankensteve" and Frank's Happy Place song also qualify.
The "China, IL is the best at math" song that played when China, IL won the math competition (and the reprise, "The mother-frickin' Dean is the best at life").
The whole "Get Your Ass Back To School" rap promo.
Growing the Beard: Though the first season is quite memorable, the extended length and more focused characterization of season 2's episodes really improved the series.
Nightmare Fuel: Just about all of "Secret Society", from massive squick of old women strippers, humans turning into animals through potion and killing anything and having sex with everything to Steve killing a girl's dog graphically.