When Jaime tells Paul they're having Rosemary Chicken, Paul asks, "Wasn't that Nixon's secretary?" This is a reference to Rose Mary Woods, who achieved notoriety for claiming that she accidentally erased a critical section of the infamous Watergate tapes and that wasn't done deliberately by Pres. Nixon.
When Paul is telling Ira that he is having a second thought about Jamie because the other day she looked different when the light struck her face in an angle. 3 years after that episode in "Seinfeld" the 10th episode in the 9th and final season "The strike" Jerry Seinfeld would date a woman who will look different every time the lighting conditions change leading up to the eventual breakup.