This is a pretty interesting site, if you believe the guy's conclusions. Here are a few of the issues he deals with:

True or False?

Lucille Ball and Desi Arnaz divorced twice.

[url=https://legendsrevealed.com/entertainment/2009/04/19/tv-legends-revealed-history/The%20Beverley%20Hillbillies'%20original%20theme%20song%20included%20two%20alternate%20verses%20(each%20one%20about%20their%20sponsor)!]The Beverley Hillbillies’ original theme song included two alternate verses (each one about their sponsor)![/url]

Jay Thomas’s character on Cheers was killed off because he called Rhea Perlman ugly.

Did M.A.S.H. Really Never Show Radar O’Reilly’s Left Hand on the Show? 

Johnny Carson accidentally caused a toilet paper shortage in 1973.

Larry David had scenes from an earlier episode of Seinfeld re-shot so that Jerry Stiller could play the role of Frank Costanza in all of the Frank Costanza appearances.

Dr. McCoy’s medical instruments on Star Trek were really just fancy salt shakers.

Lost in Space coined the term “Does Not Compute”

Paul McCartney had a hidden message in an episode of The Simpsons

There were no black people in Mayberry.

Here's the full page with all the various "myths" and supposed answers. Not sure if I buy them all, but it sure is a fun timewaster for those into obscure TV trivia like yours truly.

Entertainment Legends Revealed