Over the course of 2 seasons, a long list of famous people have been referred to on the show.
I'll begin the list of people that I can recall at the top of my head.

Frank Sinatra, Mickey Rooney, Cesar Romero, Frederick March, Marlon Brando, Tuesday Weld.

Don't forget about how they were always mentioning other TV shows, like, Leave It to Beaver, Father Knows Best, Donna Reed, Car 54 Where Are You?, Batman, My Mother the Car, & Dobie Gillis.

My Three Sons. "That crazy, mixed-up family who are always having those weird, fantastic adventures." - Grandpa.

Zsa Zsa Gabor, Abraham Lincoln, Svengali, Dr. Jekyll and Mr. Hyde, Ed Sullivan, Elizabeth Taylor, The Jolly Green Giant.

Kate Smith, President Johnson, Gene Kelly, Leo Durocher, Dracula.

Lassie, David Susskind (Talk show host), Napoleon, Charles Dugal
....now I have to watch the DVDs for the names.

Constance Spannard (The Late Late Show), Tony Curtis, Jack Lemmon, Galileo, Richard the Lionhearted, Mickey Mantle.

They did once mention The Ponderosa, which is a referance to Bonanza.

Don't forget about how they were always mentioning other TV shows, like, Leave It to Beaver, Father Knows Best, Donna Reed, Car 54 Where Are You?, Batman, My Mother the Car, & Dobie Gillis.
Munsters#1, Which episode mentions Batman?

It's not in any episode, it's in "Munster, Go Home!".