Isn't it weird how we never see Donald Glover and Childish Gambino in the same room?

That's refrencing something. That's not a concept episode. The first semi-concept episode was Contemporary American Poultry, and the first full on concept episode was Modern Warfare. That's 1.5 for season 1. This season we've had at least 4 big concept episodes.

We haven't seen Jeff, Hickey, Duncan, or Chang teach all season. (Jeff had a tiny teaching part in the second episode). I want to see the show in Greendale Community College, you know, an ACTUAL COLLEGE.

I found an interview which says that Joel and Chevy were somewhat closer than Chevy's other friendships within the cast.

Either 'Koogler' or 'College Cut Ups 2: Panty Raid Academy'