Green Acres to Mrs Columbo

Petticoat Junction was a spin-off of The Beverly Hillbillies. Petticoat Junction spun off Green Acres. All three shows crossed over numerous times.

The Beverly Hillibillies? Granny appeared on an episode of Mister Ed (see below for more on The Beverly

Hi Honey, I'm Home!'s Lloyd was friends with Mister Ed

The Mary Tyler Moore Show's Georgette Baxter crossed over onto Hi Honey, I'm Home!

Lou Grant spun off of The Mary Tyler Moore Show

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

Columbo spun off Mrs Columbo