As a sitcom fanatic -- watching the vintage classics, checking out the new stuff -- you always hope to see a new situation for comedy to work its magic in. And in this episode you get three (3!). You get three new, fresh, and extremely well-played subplots in one episode.
Won't spoil anything for you, but will say that the Missy-George storyline really popped up with a completely unprecedented moment, that worked, big time. And they pull it off splendidly, with the help of a generous-spirited secondary character, which really feels good. The Sheldon arc shines a bright light on one of his characteristics that plays out consistently all the way through the Big Bang, and we go "Yep. He's always been that way." And in the Mary-Georgy sequence, we get to see some barriers drop and watch the characters reveal a bit more about who they really are, pretense aside.
And watching the Meemaw-Sheldon contrast as it goes back and forth is one of life's special joys.
It's an extremely satisfying episode.
(And c'mon -- how many of you knew what a "docent" was before watching this?)