Goober and the Trucker's Paradise [pilot only] to It's Always Sunny in Philadelphia

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.

was a spin off of The Andy Griffith Show

Gomer Pyle, U.S.M.C was a spin off of The Andy Griffith Show

The Lucy Show's Lucy Carmichael was accidentally drafted into Gomer Pyle, USMC's company on an episode of The Lucy Show.

Here's Lucy's Mary Jane Lewis was originally a character on The Lucy Show (also called The Lucille Ball Show).

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

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

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

Charlie of Lost once dated a girl whose father worked for a paper factory in Slough. The paper factory in Slough is the paper factory of The Office (UK).

David Brent on The Office (UK) wore a Sergio Georgini leather jacket. A Sergio Georgini bag was on It's Always Sunny in Philadelphia.