Mayberry R.F.D. to The Facts of Life

was a spin off of The Andy Griffith Show

Gomer Pyle, U.S.M.C was a spin off of The Andy Griffith Show

Gomer Pyle appeared on Hi Honey, I'm Home!

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

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

The Facts of Life was a spinoff of Diff'rent Strokes