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.
Ensemble Darkhorse: There's more to the series than Kei but she's all most people talk about.
Squick: Watching Professor Itsuki eat things like Kiviak, a Greenlandic Inuit delicacy which is made by killing a seal, stuffing it with 70 odd seagulls, and burying the seal for a couple months. Then you take it out, pull out a seagull and suck out the liquefied innards through its ass. The very idea of eating this would count as Nightmare Fuel.
On a more mundane level, when Sawaki first steps into Misato's and Kawahama's horribly dirty dorm room, all he can see is a wall of mold spores. Plus, when he shakes hands with someone, he could see he didn't wash after using the toilet...
And then there's the part where Sawaki has to stick his hand up a cow's butt. This is, alas, Truth in Television.note Among other things, it's used to determine if female cows are in heat or pregnant. Much like human males get a finger up the rear to check their prostate, cows get a hand up their bum to check the status of their uterus.