The phrase "shameless hussy" was not actually used. Should've been, though.
This is yet another joke I've borrowed from the Bonzo Dog Band's "Shirt":

Could I have this shirt cleaned express, please?
That'll be three weeks, dearie.
But the sign outside says 59 Minute Clean!
That's just the name of the shop

The rabbit is, I believe, one of Rina's characters. The playbill wound up becoming fairly important during Minervacon, since Kimberly couldn't prove that Brisbane performed at the Minerva Theatre because of this.
This arc is called One Page. It wasn't just a reference to the playbill. Each day a new comic was added to the front page, so on Friday you saw all five. There was less recapping and less time passing between each comic, I suppose. It was meant to be seen as one coherent unit. Most comics happen one right after the other, though, regardless. I think I had just read one of Scott McCloud's books and wanted to do something artistic with the comic.
Brisbane saves vs. apology. Natural 20.
One Page drawn by Rina Tay