City of Angels to Love That Bob

Lou Grant centered around Lou as editor of the fictional Los Angeles Tribune which has since been featured on City of Angels

Lou Grant spun off of The Mary Tyler Moore Show

The Mary Tyler Moore Show's Georgette Baxter crossed over onto 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.

The Bob Cummings Show was repackaged and ran in syndication as Love that Bob.