The bickering over what to name the male bra was inspired by the real life argument between Larry David and the episode writers when they themselves couldn't decide what to name it.
During the scene where Frank (Jerry Stiller) crawls into bed with George, Jason Alexander (George) couldn't stop breaking into laughter. It took dozens of takes to get the shot.
Kramer and George acting out the pretend mugging was based on real life experience of writers Max Pross and Tom Gammill who used to do the same thing when they lived in New York.
The story line of the male bra was inspired by a series of Ann Landers columns that co-writer Tom Gammill read as a kid that featured women complaining about their husbands' breasts.
Larry Miller, stand-up comedian and close friend of Jerry Seinfeld, was considered for the role of George Costanza, before it was decided that George should be noticeably shorter than Jerry (Miller and Seinfeld are both about 5'11", Jason Alexander is 5'5").