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: GA Geijutsuka Art Design Class
Ear Worm — The opening theme, but especially the ending—yes, all five versions of it.
Moe— after all, the mangaka mentioned this series is drawn in puni-moe.