This episode is called "The Apartment". The episode is probably called this as a tribute to "Seinfeld". They probably did this because Michael Richards(Cosmo Kramer) is in this episode. The episode was probably named "The Apartment" because every episode of Seinfeld (besides the pilot, Highlights of a Hundred, and Male Unbonding) starts with the word "The".
The Buchmans live in Apartment 11D.
Paul: Hey, whatever happened to that Jerry guy?
Kramer: He's writing a sitcom for NBC.
Paul: It was a brush with death. I literally saw my life flash before my eyes.
Jamie: What was I wearing?
Paul: There's two things I don't like to lend: money and my internal organs. Cause you don't get either one back.
Fran: Don't waiver. I had Mark moving boxes out of his apartment an hour after I proposed.
Jamie: Can't you just look at death as a wonderful adventure?
Paul: Uh... I don't think so. No.
Jamie: I told you, I'm being cremated. I can't believe you don't want to come with me.
Paul: Hey, don't take it personally. I told you I don't want to die, period!
Jamie: So we're breaking up?
Paul: I guess so. (pause) You're off to the furnace, I'm off to the freezer.
Paul: I don't need an out, I don't want an out, I want in!
Jamie: Not tonight!
Cosmo Kramer ("Seinfeld") appears in this episode, and Jerry Seinfeld ("Seinfeld") appears in another (he was playing himself, so we can't know if he was the Seinfeld known by the show, or by his comedic performances in pubs). But, in one "Seinfeld"'s episode, George Costanza & Susan Ross said that "Mad about You" is a show, so Cosmo Kramer's appereance in this episode isn't explained.
Michael Richards crosses over as his "Seinfeld" character Cosmo Kramer.
When Paul asks Kramer what 'that Jerry guy' is up to, Kramer answers that he is writing a show for NBC. In the fourth season of Seinfeld (1992-1993) there is a story arc about Jerry and George writing a sitcom.