That in an of itself brings to mind something else shows like this had in common: celebrity guest stars being brought in (sometimes on a weekly basis) to boost slumping ratings . . . and more often than not, said celebrity guest stars had some sort of history with one or more of the main characters. In the case of THE ODD COUPLE, Felix was apparently in a USO troupe with Richard Dawson, not to mention all of the different athletes Oscar was pals with; meanwhile with SANFORD AND SON, Della Reese was the niece of one of Fred's friends, and B.B. King became a blues singer because Esther broke his heart!