Adaptation Sequence: Newspaper Comic —> TV show —> Cartoon —> Video Game —> Movie —> TV show loosely based on movie —> Video Game —> Sequel to movie —> Broadway Musical
Beam Me Up, Scotty!: Morticia is often quoted saying, "Normal is an illusion. What's normal for the spider is chaos for the fly." However, no one is sure when exactly she said that.
She does say the line in The Musical, but it seems to be a reference to the presumed earlier quote.
Keep Circulating the Tapes: To this day, there has never been a DVD release for the following Addams Family films and shows: The Addams Family Fun-House, Halloween with the New Addams Family, the 1992 animated series, Addams Family Reunion, and — at least in America — The New Addams Family (the latter being caught between Saban and Disney- what else would you expect from a Fox Kids/Fox Family show?).
One Normal Night: From the song of the same name in the 2010 Broadway musical, where Wednesday, hoping to set a good impression with her fiance and his family, requests that the Addams clan try to behave like average human beings. As expected, they can't, and Hilarity Ensues.
What Could Have Been: After Illumination Entertainment obtained the rights to Charles Addams' original cartoons, there was a planned stop-motion animated film with Tim Burton calling the shots. As of July 2013, the project has been cancelled.
Actor Allusion: The 1960s TV episode "Morticia The Breadwinner" contains one to Morticia's actress, Carolyn Jones, whereupon Morticia and Uncle Fester are deciding on a good assumed name they can use to call Gomez's stockbroker: 'Jones?' asks Morticia. 'What kind of a name is that?!' replies Uncle Fester irritably.
Dueling Shows: With The Munsters. The Addams family were humans that acted like monsters, but the Munsters were monsters that acted like normal humans. It was an interesting contrast.
Fake American: The entire cast of The New Addams Family (apart from Gomez and Wednesday) were Canadian.
The Other Darrin: A sort-of example from the series: the man playing Thing occasionally used his left hand just to see if anybody would notice.
Recycled Script: Most of the episodes of The New Addams Family were recycled from the original series. In fact, the episode "Thing is Missing" is a twofer. Not only is it a remake of an episode from the original show, but it also borrows two plot elements from the 1992 animated series episode "Itt's Over" (though this time, Uncle Fester starts growing hair because he's stressed over the mistaken belief that Thing is dead rather than Cousin Itt).
Throw It In: Ted Cassidy ad-libbed "You rang?" in the pilot, and the producers kept it — and changed Lurch from a mute to allow for it.
For unknown reasons, Carol Kane replaced Judith Malina as Grandmama for Addams Family Values.
The third movie did this to most of the actors playing the family. Justified, as it's intended as a separate continuity, and the only reason it exists is to have served as the Pilot Movie for The New Addams Family.