Alphas to Goober and the Trucker's Paradise [pilot only]
12 connections
Alphas
Warehouse 13
Dr Vanessa Calder from Warehouse 13 traveled to investigate deaths on Alphas
The X-Files
On Warehouse 13 Mrs. Frederic and Steve Jinks enter The Library, a secret room in the Vatican. There is a pack of Morley cigarettes on the table
Veronica Mars
The mugshot of Malcolm T Wiggins from the X-Files episode "Titonus" appears on the wall of a police interrogation room in the Veronica Mars episode "Leave it to Beaver." Also the fictional car rental company Lariat where Mulder & Scully always rented their cars was featured prominently on the Veronica Mars episode "Rat Saw God."
Lost
In an episode of Veronica Mars, Veronica's fortune cookie had the numbers that won Hurley from Lost the lottery.
Diagnosis: Murder
The airplane that crashed and strand the cast of Lost was Oceanic Airlines Flight 815 also featured on Diagnosis Murder.
Mannix
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
Here's Lucy's Lucy Carter and Mannix's Mannix are held hostage in an episode of Here's Lucy.
Make Room For Granddaddy
Make Room for Grandaddy's Williams had Here's Lucy's Lucy Carter as a houseguest
The Danny Thomas Show
The Danny Thomas Show came back as Make Room For Granddaddy
The Andy Griffith Show
Danny Thomas Show spun off The Andy Griffith Show after Danny Williams got arrested in Mayberry.
Mayberry R.F.D.
was a spin off of The Andy Griffith Show
Goober and the Trucker's Paradise [pilot only]
Goober and the Trucker's Paradise was a failed spin off of Mayberry R.F.D. that instead ran as a one-shot special that had Goober Pyle running a truck stop.