Wilbur and Edna's duet, "You're Timeless to Me", especially in the film of the play. He starts singing to try to win Edna back after Velma made it look like they were having an affair. (Though YMMV, as Christopher Walken playing Wilbur might make the whole thing Narm to some.)
Wilbur again, when he bailed Maybelle and her dancers out of jail along with Edna, knowing it would be a financial hit for a little while.
And going with that, a deleted scene shows exactly why Edna was arrested. The police officer was originally going to let her go, but then she realizes that he's being nice to her because she's white, while arresting the black women who were protesting. Edna is so angry at this that she insults the police officer until he gives in and arrests her as well.
When Tracy and Link share their kiss at the end.
Also near the end (in the film, at least), Wilbur encourages Edna to dance. She's been so low in self-esteem for so long that it's heartwarming to see her confident and happy, and the fact that her husband backs her up just makes it better.
Maybelle, smiling approvingly when Seaweed and Penny admitted their love for each other, while warning them that not everyone would be so approving:
Maybelle: So this is love. Well, love is a gift, a lot of people don't remember that. So, you two better brace yourselves for a whole lotta ugly comin' at you from a neverending parade of stupid.