George says in this episode that his parents don't read books when we see Frank doing just that a few episodes ago in "The Non - Fat Yogurt".
It is in this episode that Kramer first comes up with the idea for a "coffee table book about coffee tables." Although in "The Opposite," while on "Live with Regis and Kathy Lee," he claims to have come up with the idea while skiing, it is actually in the Costanza's house in this episode.
When Elaine and Kramer are on the Subway they are on the #6 train on their way back from Queens to Manhattan. The #6 train does not run in Queens. The #6 goes only between the Bronx and Manhattan and certainly does not stop at Queensboro Plaza. The cars on the #6 train do not have seats facing forward or backward, so it is possible that the interior shot was done inside of the N/W line. This is evident from the yellow color scheme of the train seats, unique to the N/W (the 6-train color is scheme is green). Also, the N/W cars have front and rear facing seats, whereas the 6-train does not.
Estelle and Frank find a condom wrapper upon their return. George confesses to having sex in "their" bed claiming his bed is too small. However, it was revealed in The Money (S8,Ep12) that the Costanzas sleep in separate (twin) beds due to Estelle's "jimmy arms." Says Frank, "we came to an agreement 30 years ago. It was the only way I could get some rest."
Weird guy: (to Elaine) You look scrumptious!
Kramer: (selling his coffee table book idea) And on the cover is a built-in coaster.
Frank: How do you just walk into a house and take a TV Guide? How does she expect you to watch TV? Am I just supposed to turn it on and wander aimlessly around the dial?
Jerry: Ya know, I don't get it. I'm not allowed to ask a Chinese person where a Chinese restaurant is? I mean, aren't we all getting a little too sensitive? I mean, somebody asks me which way is Israel, I don't fly off the handle.
Weird guy on subway: (to Elaine) See, on this particular Tuesday you could've watched six hours of Lucy. There's I Love Lucy, The Lucy Show, Here's Lucy!
Frank: (to George) What is this? A prophylactic rubber?
Estelle: What is this doing on my bed?
Jerry: (Complaining about the Chinese mailman's reaction) When someone asks me which way is Israel, I don't fly off the handle!
Jerry: You can't give something and take it back that makes you an.....
Winona: A what? An indian giver?
Jerry: I'm not familiar with that term!
Frank: That's it! You're grounded!
Frank: I'm missing TV Guide volume forty-one, number thirty-one.
George: I hope prune juice is alright. It's the only thing I had that was chilled.
George: I'm sorry about that lock on the liquor cabinet. The combination must have just flown out of my head. It's a mental block.
Sylvia: (regarding photo) Ahh! Is this your son in the bubble bath?
George: ...No, that's me.
Estelle: (to Sylvia) George doesn't work. He's a bum.
George: We're collectors. We see objects of great beauty and we must have them.
Kramer: Hey, you know what would make a great coffee table book? A coffee table book about coffee tables!