Harvey Korman returns as Prof. Fagenspahen for the last time in the series... Korman has played 3 different characters over the 2 seasons.
As Lily and Grandpa muse over what Herman is doing, she says, "The last time he met with strangers, they sold him the Vic Tanny franchise for Greenland." Vic Tanny was a bodybuilder and businessman who is regarded as the pioneer of the modern health club.