The Bob Cummings Show to The Facts of Life

Here's Lucy's Lucy Carter was visited in two episodes by The Bob Cummings Show's Bob Collins.

Here's Lucy's Mary Jane Lewis was originally a character on The Lucy Show (also called The Lucille Ball Show).

Mr. Mooney from The Lucy Show was 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