"The Stranded" was on earlier tonight ('Maybe the dingo ate your baby'). I haven't seen it in ages. I studied it. And the following did appear before me:
When Jerry and Elaine are at the party on Long Island (and are saving each other from various boring conversations with the other partygoers), at one point Elaine is telling someone she reads manuscripts for Pendant Publishing. Jerry happens by and says, "Pendant? Those bastards?" - just like Alton Benes said to Elaine in "The Jacket." Later, when Kramer and the host of the party are drinking in Jerry's apartment, we hear Kramer tell the guy the rest of what happened with the doves he was tending to while he kept Elaine waiting in the car in "The Jacket" (which, of course, we know from the story Elaine told to Jerry and George in that ep).
Elaine, THAT is interesting writing!
-B.