Fringe to Vinnie & Bobby

In the pilot of Person of Interest John Reese's suspect Diane Hanson has emails numerous characters from Fringe

In the pilot of POI numbers 4-8-15-16-23-42 appear as the time stamp of a surveillance camera, the same numbers won Hurley the lottery on Lost

The airplane that crashed and strand the cast of Lost was Oceanic Airlines Flight 815 also featured on Diagnosis Murder.

Mannix returned to TV on an episode of Diagnosis Murder to solve an old unsolved case with the help of Dr Mark Sloan.

Here's Lucy's Lucy Carter and Mannix's Mannix are held hostage in an episode of Here's Lucy.

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!

Leave it to Beaver's June Cleaver crossed over onto Hi Honey, I'm Home!

Eddie Haskell from Leave it to Beaver appeared on Parker Lewis Can't Lose

Bud Bundy from Married...with Children showed up on Parker Lewis Can't Lose

Vinnie & Bobby was a spin off of Married...with Children original titled Top of the Heap