What a classic episode "The Switch" was. Best of this season IMHO. All of the regular characters, including..yes!...Newman in brilliant and hilarious interlocking stories.
We got Kramer's first name, and as a bonus, his mother as a restroom matron! Great Elaine subplot with the tennis racket (including return of a totally minor character -- the woman from the publishing house). George's screw up in the attempt to catch his bulimic girlfriend in the act (priceless "freshen up" scene, "You're fresh, you're very fresh"). The little grade B movie parody of the hatching of the "switch" plot. And of course catching Newman with Kramer's mother.
The whole episode big-time laugh out loud.