Other things reused from previous episodes:
At one point Jerry tosses a towel onto Kramer's face. In "The Red Dot," Mr. Lippman tossed the cashmere sweater onto George's face.
Kramer takes a picture of Mr. Kruger without his shirt. He also captured Elaine's nipple in "The Pick," and George in his underwear in "The Package."
Expecting imminent unemployment, George wonders about joining the Coast Guard. In "The Revenge," he considered a list of jobs for which he was obviously unqualified.
Elaine's neighbor's cat won't stop meowing. In "The Engagement," her neighbor's dog wouldn't stop barking.
Kramer takes seriously Jerry's sarcastic remark about having a stock room. In "The Pothole" he took seriously Jerry's sarcastic remark about having a shed out back.
Elaine tells Kramer that she's got to stop off the circus and Kramer mentions that he's afraid of clowns. In "The Gymnast" when Jerry and his girlfriend went to the circus, he tells Kramer that he's coming with him, then Kramer tells him that he doesn't want to go because he's afraid of clowns.