When Will, Grace, and Grace's mother are at the restaurant and Grace gets up to leave, you can see in the background that she has her arms in the sleeves of her coat. In the next scene, the coat is around her shoulders.
The position of the diaries around Grace.
The position of the bread-sticks in the bowl, in the restaurant.
At the beginning of the episode it is revealed that Jack has rented Star Wars, to which Grace says, "Jack, I'm dreaming of Jabba the Hut.". Jabba is not in Star Wars but in Return of the Jedi.
Grace is reading out loud from an old diary about a Jr. High prom on April 16, 1980. That was on a Wednesday. A prom on a Wednesday?