* ActorAllusion: Ditto is not RobPaulsen's first role as [[WesternAnimation/{{Animaniacs}} a black-and-white wisecracking creature of indeterminate species.]]
** In one episode where Ben and Gwen get sucked into a video game, Grandpa Max tells them to [[VideoGame/MetalGearSolid2 turn the game console off.]]
*** One video on Youtube explicitly noted that, like his role as [[VideoGame/MetalGearSolid Colonel Roy Campbell]], he carries many, many secrets and often acts as mission control.
* HeyItsThatVoice
** Creator/TaraStrong plays Ben Tennyson, Upgrade, Benwolf, and Buzzshock.
** Creator/SteveBlum portrays [[BigBad Vilgax]], [[PlayingWithFire Heatblast]], [[OurGhostsAreDifferent Ghostfreak/Zs'kayr]], as well as many, many other voices.
** Creator/PaulEiding is Max Tennyson.
** You know how Ben's this intergalactic hero? He had a good teacher, literally. Voiced by Creator/JenniferHale, aka [[Series/MassEffect Shepard.]]
** Creator/KharyPayton and Creator/KariWahlgren are respectively Hex and his niece, Charmcaster.
** Before the [[TheOtherDarrin voice change]], Kevin Levin is [[Anime/DigimonAdventure Matt Ishida]]!
** Creator/JimWard is Wildvine, [=XLR8=], and Diamondhead.
** Creator/FredTatasciore is Ripjaws, Cannonbolt, Way Big, and Future Ben.
* The first live action movie, ''Race Against Time'' was directed by none other than [[BillAndTedsExcellentAdventure Bill S. Preston, Esquire]]!
* IKnewIt: In the first episode Max corrects Gwen that Ben had turned into an alien instead of a monster, leading fans to think he was involved with aliens sometime in his past, as it turns out he was part of a an intergalactic law-enforcement organization called the "Plumbers".
* WordOfGod states that Humans (Homosapians) in the series actually have special powers all their own but it isn't as obvious as other species. They can interbreed with most other species, they are one of only a very select few who can us magic and manipulate mana, and they are the only species who have a form of Adaptability which makes them suited to live in various climates, terrains, and even outer dimensions with little to no effort.
* At the very end of the where the elves try to get Grandpa Max to be Santa, you'll notice that the three children who talk to the old man look familiar. Who are they? Why, none other than Konohamaru, Moegi, and Udon from Naruto!
* WhatCouldHaveBeen
** Originally, Ben would have transformed into HUMAN superheroes, with the show seeming to be more inspired by ''ComicBook/DialHForHero''.
** Ben's first design had him as a freckled redhead.
** Gwen was originally going to be a classmate and one of his best friends, and she appeared in earlier concept art with a long ponytail and a pink shirt. She was changed to be a cousin since they may have been unable to figure out a decent reason for her to be on the road trip otherwise. The classmate aspect of this is referenced in the WhatIf episode "Goodbye and Good Riddance", where they become classmates at the end of the episode in order to better combat villains that might attack their hometown.
** Man of Action's idea for the sequel series was ''Ben 10: Hero Generation'', in which a teenage Ben and Gwen would become mentors to a group of kids with mysterious alien powers. However, Cartoon Network gave the sequel project over to Glen Murikami and Dwayne [=McDuffie=], and ''WesternAnimation/Ben10AlienForce'' was developed instead. While some remnants of Man of Action's concept can be found with the "Plumber's Helpers" characters, they take a backseat to the action and are not mentored by Ben and Gwen, who instead fight evil alongside a [[HeelFaceTurn reformed Kevin]] instead.