Kimberly Beck also (along with Mark Hamill) only appeared in the pilot. She left to do the series Rich Man, Poor Man and was replaced by Dianne Kay.
Mark Hamill only played David Bradford in this initial episode. He was later replaced with Grant Goodeve.
The phrase "Never Try Eating Nectarines Since Juice May Dispense" is a mnemonic for the Bradford children's names: Nicholas, Tommy, Elizabeth, Nancy, Susan, Joannie, Mary, and David.
The mnemonic for oldest to youngest is "Dumb Martians Just Sit Nicely Eating Tender Noodles"