Amy Hill guest stars as Kim, and John O'Hurley guest stars as J. Peterman, who is based on the real-life John Peterman, famous for selling props from the Titanic movie. Of course, the special guest star in The Understudy is Bette "Beaches" Midler, and all credit to her for chewing the screen and being part of the Seinfeld universe. One scene has Kramer walking the streets of New York City, and it's not a backlot in Los Angeles, it's actually in New York City. Kramer becomes Bette's protector and looks after her while she's recovering in hospital following the softball kerfuffle that caused her injury.