Silver Spoons to The Bob Cummings Show

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!.

Alice & Trixie from The Honeymooners crossed over onto Hi Honey, I'm Home!

Here's Lucy's Lucy was driven around Miami by Ralph Cramden of The Hooneymooner's

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