One of the patrons of Sally's bar is author Jonathan Ames, who wrote the novel which the movie is based on.
Kevin Kline was a student in Marian Seldes' acting workshop.
Ms. Seldes played Vivian Cudlip, this was her last film.
In the "upper crust" society of New York and Palm Beach, escorts are often called "walkers," and some men do make a career out of being walkers.
When Kevin Kline went on to promote the movie, interviewers stated that it was as if the part had been written for him and no one could imagine anyone else playing the part of Henry Harrison.
Kevin couldn't either.