Silver Spoons to The Many Loves of Dobie Gillis

Diff'rent Strokes' Arnold did a story for his school newspaper on Silver Spoons' Ricky.

Hello Larry's Larry Alder crossed over onto Diff'rent Strokes for 3 different 2-part episodes

Hello Larry's characters were mentioned on Hi Honey, I'm Home!.

Many Loves of Dobie Gillis' title character crossed over onto Hi Honey, I'm Home!