Eleanor Audley, who plays Oliver's mother, was in real life only five months older than Eddie Albert, who plays Oliver.
The student who knocks into Oliver is played by Jack Bannon who is the son of Bea Benaderet who starred in Petticoat Junction (1963). Along with that series and this one, he also had multiple guest spots in another series from the 1960s that his mother had a prominent part in: The Beverly Hillbillies (1962).
The lab analysis of the Douglas farm's soil reveals it's 38% bath powder, 28% hand lotion, 14% toothpaste, 12 1/2% cold cream, and 8% nail polish remover. This equates to 100.5%
The leopard print couch that Lisa gave away as a prize in season 1, episode 7 is now back in the Douglas' living room.
Eunice's punishment for tampering with the soil samples is five dates with Uncle Joe Carson.