Everyone in this sketch is really funny, but Grover steals the show as the stage manager. I'm trying to figure out why the Sesame Street Little Theater has a scrim for a curtain. Maybe they let Grover place the order.
Bert's funniest line: "Oh, excuse me sir."
Ernie's funniest line: "The beaches are open / For men and for wimming."
Prairie Dawn's funniest line: "Spring comes after winter, you silly!"
Cookie Monster's funniest line: "Leaves not bad either!"
Grover's funniest line: All of them, but I particularly like, "Oh, a thousand tweets!" and "Sorry, I could not find the sunshine!"
Herry is mostly funny because it's clear that his heart really isn't in this, in spite of his elaborate costume.
Then there's the unintentional humor that the actions don't always match the audio. Oops.