When Jerry discovers his picture has been defaced in the lobby, Kramer says, "don't worry…I made double prints". This is impossible, as Kramer took the original photo with a Polaroid Instamatic camera, which prints out one self-developing photo when a picture is taken. It's impossible to make an actual double print using that type of camera/film.
The episode features the first male - on - male kiss on Seinfeld.
Both Jerry and Uncle Leo are called over to Nana's house to open the ketchup bottle. When she goes to hand the bottle to Jerry, he and Uncle Leo fight over who will open it, and in the end, Jerry lets Uncle Leo handle it. However, after a few moments, Leo still hasn't been able to open it. He simply hands it back to his mother who sits on the couch trying to open it. It got lost in the discussion of the money from the track, but the whole point of Jerry and Leo being there was to open the ketchup, and that never got done.
Kramer emphasizes how much he likes the idea of everyone in the building knowing each other's names, even commenting that that's the type of society he wants to be living in. However, in "The Non-Fat Yogurt", he makes fun of the idea of New Yorkers wearing name tags for that same reason.
When you see the picture Kramer took, Jerry is looking from the right side, but when Kramer actually takes the picture, Jerry is turning to his left side.
After Kramer implements his reaching out program in the lobby, a tenent walks out from the elevator and says, "Hi, Cosmo." However, Kramer has his LAST name posted on the bulletin. It is possible that they've met before, but in this instance, Kramer is demonstrating the popularity of his new "get to know each other" program.
When Kramer takes Jerry's picture for his board, he uses a Polaroid camera, and got an instant Polaroid print. Nevertheless, the picture later shown in the lobby of the building is an ordinary paper print. In addition, if you consider the distance from which Kramer took the picture you can hardly get that face-fit framing unless using some sort of special lens or zoom, a thing I've never known avaliable for Polaroids...
Jerry: I'll tell you another thing, Cosmo Kramer or whatever you want to be called, the kissing thing is over. There's no more kissing and I don't care what the consequences are!
Jerry: I'm going on record right now that was my last kiss hello. I am getting off the kiss program with her.
Jerry: Well, frankly, outside of a sexual relationship, I don't see the point to it. I'm not thrilled with all the handshaking either, but one step at a time.
George: I love these people. You can't ask them questions. They're so mentally gifted that we mustn't disturb the delicate genius unless it's in the confines of an office. When huge sums of money are involved then the delicate genius can be disturbed!
Kramer: You don't rob someone if you know their name!
Jerry: You're robbing me.
Jerry: If you could say touch her breast is part of the kiss hello, then I think I could see the value in it a little bit better.
Elaine: How about an intercourse hello? How would that be?
Jerry: Elaine, now you're just being ridiculous.
Jerry: You don't flamenco on the first date.
George: (to secretary) Will that be cash or check?
This is the last episode written by Jerry Seinfeld.
(Jerry is being shunned by fellow tenant Mary since refusing to kiss her hello)
Jerry: Mary… Oh, Mary!
This is strongly reminiscent of the 1946 classic It's A Wonderful Life in which George Bailey (James Stewart) trys to get his wife Mary (Donna Reed) to recognize him in his alternate reality.
Jerry: (to Kramer) I'm like Richard Dawson down there now.
Richard Dawson was the host of the game show Family Feud. Dawson would frequently kiss the female contestants on the show.