Robert Reed's daughter Karen Rietz appeared in "The Slumber Caper", as Marcia's friend Karen. He otherwise rarely got to see her, after he and Karen's mother were divorced in 1959.
The daughters of Robert Reed, Florence Henderson and Sherwood Schwartz appear in this episode as friends of Marcia.
The girls at Marcia's slumber party play a game that many modern audiences may not be familiar with, called "Ha." All the girls lay down in a circle, with their heads on another girl's stomach. The first girl says "ha" to begin, the second says "ha ha," the third says "ha ha ha" and so on, until finally everyone laughs too much to continue the game.