In the exchange Jerry and Elaine have at Monk's about Newman, there are two paraphrased quotes from the famous British Prime Minister Winston Churchill: "There's less to him than meets the eye," referring to Clement Attlee, the PM who succeeded Churchill. This one is paraphrased in the dialogue: Elaine: "Maybe there's more to Newman than meets the eye." Jerry: "No. There's less."
"It is a riddle wrapped in a mystery inside an enigma…" referring to Russia is paraphrased with Elaine saying almost these exact same words about Newman, then Jerry responding "No, he's a mystery wrapped in a Twinkie."