I just watched it, and it was like a beautiful, artsy version of the Community clip episode that's almost all clips from past episodes we never actually saw (fitting, since Joel McHale came back for it).
Also, I keep having to process stuff about my own dysfunctional family and upbringing while watching this show. The way little bad moments are floating up to surface for him, not as full flashbacks but more like intrusive thoughts, hits a little too close to home. "Fishes" from last season had way too many little moments that I could relate too directly...