Day by Day to The D.A.
12 connections
Day by Day
Family Ties
Family Ties' Steve Keaton went to college with Day by Day's Brain Harper
Parker Lewis Can't Lose
Andrew Keaton from Family Ties appeared in an episode of Parker Lewis Can't Lose
Leave it to Beaver
Eddie Haskell from Leave it to Beaver appeared on Parker Lewis Can't Lose
Hi Honey, I'm Home!
Leave it to Beaver's June Cleaver crossed over onto Hi Honey, I'm Home!
The Honeymooners
Alice & Trixie from The Honeymooners crossed over onto Hi Honey, I'm Home!
Here's Lucy
Here's Lucy's Lucy was driven around Miami by Ralph Cramden of The Hooneymooner's
Mannix
Here's Lucy's Lucy Carter and Mannix's Mannix are held hostage in an episode of Here's Lucy.
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.
Matlock
Diagnosis Murder's Dr Mark Sloan was defended by Matlock when Sloan was accused of murder
Emergency!
Both feature the fictional Trans Global Airlines
Adam-12
Emergency! had a crossover with Adam-12 to find a boy who ran away from the hospital.
The D.A.
Adam-12 had a two part crossover with The D.A.