Arthur's love interest was portrayed by his real life wife, Anne Meara, and it was their daughter dropping off Anne's character at the dance
Anne Meara guest starred in this episode. Later on, she would play Spence's mother Veronica, who in this episode was played by Grace Zabriskie.
At the end of this episode, that's a real picture of Patton Oswalt (Spence) as a child, hanging on the back of the door, in the frame of a heart.