Trivia: Cedric Smith and Catherine Disher - who voiced Professor X and Jean Grey, respectively - were married at the time the show was in production.
Days of Future Past: Part 1 - S1-E11
Trivia: After Bishop travels into the past, he hears one kid telling another that they will be playing the new Punisher game "Assassin." When the Punisher was first being developed, he was originally going to be called The Assassin.
Trivia: The man who attempts to steal Mystique's umbrella at the beginning of the episode is a caricature of series producer Frank Squillace.
Trivia: At the end of the opening titles, there is a short bald man in a green outfit running with Magneto's crew. For years, fans had wondered who this character was, as he has no counterpart in the comics, and he only had a fleeting appearance in the season 1 episode "Slave Island." Series director Larry Houston finally revealed that the character is nobody in particular, and that he was mistakenly placed in the opening titles by the animation company AKOM.
One Man's Worth: Part 1 - S4-E1
Trivia: The man that aids Wolverine in the coffee shop is Johnny Strabler, Marlon Brando's character from the film "The Wild One." (00:16:45)
The Juggernaut Returns - S3-E17
Trivia: When the new Juggernaut crashes through the film studio, the production being filmed is a parody of Mighty Morphin' Power Rangers. There is even a short musical phrase similar to MMPR's theme song. (00:16:10)
Trivia: This episode depicted Bella Donna as being Gambit's former fiancée. In the comics, the two were actually married. This change was likely made for the show due to it being too mature of a theme for a kids' show for Gambit to have both an estranged wife and an extramarital relationship with Rogue.
Mojovision - S2-E11
Trivia: The robot that attacks Jean Grey is a replica of the Punisher. (00:16:05)
Trivia: When Wolverine is explaining Omega Red's back-story to Colossus, a picture of Captain America is briefly visible. This is a nod to the comic books, where Omega Red was the Soviet Union's attempt to create their own super soldier similar to Captain America. (00:14:05)
Trivia: One of the images in Gambit's mind-scan is of fellow Marvel Comics superhero Ghost Rider. (00:07:45)
The Dark Phoenix (2): The Inner Circle - S3-E12
Trivia: The main antagonists in this episode as well as the episode that follows it are the Inner Circle. In the comics, the Inner Circle are a sort of clandestine group of mutants that operate within an elitist social group known as the Hellfire Club. Due to censorship reasons, the Hellfire Club aspect of the group is not acknowledged. Its members are visually based on famous actors. Sebastian Shaw is based on Robert Shaw, Harry Leland is based on Orson Welles, Donald Pierce is based on Donald Sutherland, and Mastermind in his Jason Wyngarde persona is based on Peter Wyngarde. The White Queen/Emma Frost is based on the character Emma Peel from the British television series "The Avengers."
Trivia: Despite its guitar-driven sound, the theme song for this show was actually written entirely on a keyboard using MIDI technology. Composer Ron Wasserman attributed this to having hardly any gear to work with, which only consisted of a nice mixer board that had EQ in it, and one compressor. He even admitted to pouring a Coke into the first console so that they would buy him a new one.
Mojovision - S2-E11
Trivia: When the camera is panning across Mojo's studio audience after he has abducted the X-Men, you can see an older man in the middle of the crowd. This man is a caricature of Marvel Comics legend Jack Kirby. Coincidentally, Kirby died the day after this episode originally aired. (00:07:52)
Trivia: Mjnari was modelled on producer/director Larry Houston's son, Adrian.
Suggested correction: How is it trivia that a show has been pitched, but not produced or even confirmed?
This is a highly popular show and the creators have shown interest in a continuation of it. Just because it hasn't been confirmed doesn't mean people won't find the idea interesting. Also, asking how something is trivia is not a valid correction.
Phaneron