Billy Martin was the manager for the Yankees for a total of six times. Five of those were under a 10 year period from 79 until late 88, but he was always replaced after the first mandate. He has also been connected to the Yankees for a long while before. He died in 89. This might be why Steinbrenner mentions his name so many times when he speaks about all the persons he has let go over the years.
Jerry has a napkin tucked into his shirt collar while he's eating the mutton. He removes the napkin, spits some of the mutton into it, and hides the napkin in his coat. The camera shows him without the napkin in his shirt, shifts over to Holly, and when it comes back to Jerry, the napkin has returned.
When Kramer is talking to Paul O'Neil in the Yankees clubhouse O'Neil is buttoning his unifrom shirt and we see him button it all the way to the top. A few seconds later we cut back and he is buttoning it up again. Seems like a case of bad editing.
Jerry: Hey, salad's got nuttin' on this mutton.
Holly: That is so funny, did you just make that up?
Jerry: I wish I could take credit for it. It's actually a line my butcher uses when we're chewing the fat.
Kramer: Two? Sure kid, yeah. But then you gotta promise you'll do something for me.
Bobby: I know. Get out of this bed one day and walk again.
Kramer: Yeah, that would be nice. But I really just need this card.
Holly: Do you always stuff meat in your pocket?
Jerry: Uh, sometimes I use the sofa.
Elaine: Thanks for mutton.
Holly: So, is the beef the way you like it?
Jerry: I usually like mine with an angioplasty.
Elaine: So, basically what you're saying is that ninety-five percent of the population is undateable?
Elaine: Then how are all these people getting together?
Jerry: I still can't believe you're going out on a blind date.
Elaine: I'm not worried. It sounds like he's really good looking.
Jerry: You're going by sound? What are we, whales?
Elaine: Veggie sandwich and a grapefruit? What are you turning into?
Jerry: A healthy person.
George: I'd rather date the blind. You know, you could let the house go, you let yourself go. A good looking blind woman doesn't really know you're not good enough for her.
Elaine: I think she'd figure it out sooner or later.
Jerry: Women don't respect salad eaters.
Jerry: You spent the night at James's? Did we?
Elaine: Yeah but we reversed positions so there was no funny business.
Jerry: Reversed positions?
Elaine: Yeah, you know, head to toe.
Jerry: So what your genitals are still lined up.
Elaine: No, because I slept with my back to him.
(long pause - no comment from the guys)
Elaine: Head to toe.
Elaine: (on the street with the dogs) I'm a nice person, don't believe what you hear.
George: Pulp can move baby!
Jerry: Hey! I eat healthy, if I have to take out an eye, that's the breaks.
After Jerry calls Kramer "Jughead", Cosmo proceeds to refer to Jerry as "Archie", Elaine as "Veronica" and George as "Mr. Weatherbee", which is all a reference to characters in Archie comics.
The promise to have Paul O'Neill hit 2 HR's is borrowed from the movie Pride of the Yankees