I'd like to think that this was taken as Esther Williams, deep in her cups, was in the audience, and let rip with a tremendously loud fart.
That's certainly as cogent an explanation as any I've come up with. I was thinking that maybe Kathryn Grayson was in the audience, and threatening to sing.
Someone mistook them for Merv Griffin and The Merm!
Every time I see Ann Miller and her lopsided "hair", I think of Forbidden Broadway's homage to Ann, "I'm So Weird." If you haven't heard it, find it! It's brilliant!!!!