We see the restaurant is named Tom's Restaurant in this episode. At the beginning the camera is pulled back to reveal the full name, whereas usually we only see 'Restaurant.'
When Elaine says her boyfriend shaves his head, George responds, "That's like using a wheelchair for the fun of it," which is what he does in "The Butter Shave."
Throughout the run of the series, Kramer (Michael Richards) rarely says "Yes." Nearly all of his positive responses are slang variations ("Yup," "Yeah!," "Giddyup," et cetera). Five episodes where he does actually say "Yes" are this episode, episodes 3:13, "The Subway," 5:2, "The Puffy Shirt," 5:4, "The Sniffing Accountant," and 8:17, "The English Patient."
Kramer is on the roof training the rooster. That's why Jerry sticks his head out the window, and even looks up and then says, " I'm coming up."
On the bad check Jerry wrote, 40 is misspelled as fourty.