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.
Crowning Moment of Funny: "When he later finished his research project, it said 'There are wild rhinos and lions roaming around in Japan.' It provoked sharp criticism, but that is a different story..."
The ending of Shiina's fight with Shishido. "RABBIT BITCH-SLAP!" Then he gets it into his head that maybe he'll turn back into a human if he does it repeatedly.
Crowning Moment of Heartwarming: The aforementioned Crowning Moment of Awesome for Kasai. Then there's the ending of the aquarium arc, where Aoi Hana is thinking about how the reason Shiina is turning back to normal while Isana wasn't was because Shiina was also bonding with the zoo animals instead of treating them badly. She then turns to Shiina and asks him if they can keep having fun while making the zoo popular. Shiina's response is to grin and say "That's a given!"