I just noticed this tonight; I don't recall this being discussed here before, so hopefully I'm no rehashing a long-dead debate.
In "The Switch", Kramer goes to see his mother, Babs, after a 5-year estrangement. Upon seeing him, she shouts his first name: "Cosmo!"
Later in the episode Newman encounters Babs, and it's apparent that they already know each other. Yet at the end of the episode, Newman is surprised to hear Babs call her son, "Cosmo".
Doesn't it seem odd that Newman had never heard Kramer's first name if he already knew Babs? Considering that she typically calls her son by his first name, if Newman had known Babs prior to her estrangement from the K-man it seems like he would've heard her call him "Cosmo".
There are a few possible explanations, of course. One is that Newman had only recently met Babs, although from their behavior and knowledge of one another that seems unlikely. Another possibility is that Babs rarely uses Kramer's first name, despite doing so on more than one occasion in this episode. Perhaps in the past he had told her not to use it out of embarrassment, which is why Newman had never heard it when he used to see Babs with her son.
Still, the most likely explanation is that plot consistency was sacrificed for a joke. Any comments?