Mandy Gonzales, who plays Mabel's mother, is only 14 years older than Selena Gomez
Martin Short's character (Oliver Putnam) says he's "three quarters Irish". According to Wikipedia, this is true since Short's father was an Irish Catholic emigrant from South Armagh, and his mother was of English and Irish descent.
Oliver says, "Where was this audience when I directed Godspell Live on NBC?" Martin Short was famously in the 1972 production of Godspell in Toronto along with Victor Garber, Eugene Levy, Andrea Martin, Gilda Radner, and Dave Thomas, and was where he met his wife Nancy Dolman.