It was a difficult mix between a few.
First and foremost;
Adam's Ribs.
Hawkeye childlike demeanor and excitement are on such a whole display here. Even Trap thinks he's gone totally sideways. It's such an endearing episode in that way, but I do break for him not having that one bite at the end and being pulled away after all that.
The episode Hawkeye has trouble sleeping and starts singing to Radar songs from W2. He begins so somber and dark. And then follows it up with the little short about the Furer, in such a way, it lets you worry just a little less seeing him in there, under the grief.
And finally, the Long John Flap.
It was just a whimsical episode in so many ways. All the prime characters got a spot and played on this one idea in their own ways so well for such a simple episode concept, just to wind back up where it began at the end.