Jerry's apartment is back to its 5A designation. In The Phone Message (1991) , his apartment was designated 3A.
When Jerry and George watch the woman feed the baby, George's legs are crossed left over right, except for one shot when they are reversed.
When George and Jerry are discussing the baby being fed and whether or not George should wear a wedding ring, George's fingers go from being laced together and apart between camera shots.
In the season 2 episode "The Apartment", Michael Richards is credited twice in the opening credits.
At the end of this episode where Jerry is doing his stand-up comedy as the end credits roll, he makes a comment about Fred Mertz. But in the last episode, "The Phone Message" (Season 2 episode 4), Jerry had mentioned that he has never seen an episode of "I Love Lucy", which happens to have the main character of Fred Mertz.