James Olson and Rue McClanahan were only 19 and 15 years older, respectively, than Jane Actman, who played their daughter.
This was filmed at the end of season 7 and held over until season 8. One can tell it was done in the springtime, as some trees are still bare and the others are just coming into bloom.
Director Arnold Laven casting his wife Wallace Earl Laven in a bit part (Dorothy, the woman who met Mannix at the plane).