[1] In this episode, Jerry wants to switch from dating a non-laughing woman to dating her roommate, Elaine has difficulty retrieving a tennis racket she loaned out, and George enlists Kramer's mother to spy on his seemingly bulimic girlfriend, leading to him learning Kramer's first name.
After playing tennis, Elaine is recognized by Mrs. Landis, who rejected her application to Doubleday but hints there may be an opening for her.
When she comes by to retrieve the racket, she learns that Landis injured her humeral epicondyle playing tennis.
However, both Sandy and Laura agree to the ménage à trois and a shocked and scared Jerry backs out.
George brags to Kramer about his girlfriend Nina, a model who maintains a stunning figure even though she eats a lot.
Kramer suggests she is bulimic, which rings true to George since she always excuses herself to the bathroom after eating.
[3] The revelation of Kramer's first name was heavily promoted by NBC in the leadup to the episode's first broadcast, and all copies of the script had "X"s in place of every instance of the name "Cosmo" to prevent it being leaked to the press.