Person of Interest to The Brady Brides

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!

Should be The Brady Bunch. The Brady Bunch's Alice crossed over onto Hi Honey, I?m Home!