A New York Yankee from 1958 to 1969, Joe Pepitone (1940-2023) is mentioned twice during the run of the series, including this episode, and again in "The Rye," Season 7, when Kramer attributes the design of Central Park to Joe Pepitone.
Julia Louis-Dreyfus (Elaine) & Ping Wu (Ping) also worked together on episode 1.17, of Arrested Development Justice Is Blind (2004), as Maggie Lizer & Proctor respectively.
The actor who plays Babu (Brian George) went on to play Raj's (Indian) father in "The Big Bang Theory."
It's not a sign on the Statute of Liberty, but a poem, "The New Colossus," by Emma Lazarus.