- Actor Allusion:
- In "Operation: Wingman". Noah, who is played by Fred Savage, goes to prom with Claire, a girl voiced by Danica McKellar, who is well-known for playing Savage's love interest Winnie Cooper in The Wonder Years.
- Hunter Cain was able to rouse people into a frenzy and get them on his side? Yep. Super strong? Definitely. Does anyone know a wrestler like that? He also hits Rex with an Attitude Adjustment
- Bonus Episode: The last episode of the series aired was "Rock My World", which doesn't really have anything to do with the overall plot. However, it seems that the producers realized it would be the very last episode instead of "End Game" and threw in an Animation Bump, Awesome Music original to that episode, some light Fanservice by bringing back Holiday's little sister, and crafted the plot to be just 22 minutes of Rex being awesome to let the series end on a high note.
- Descended Creator: Man of Action Studios themselves as their author avatars, the gang of teenage delinquents who call themselves "men of action".
- Fake Brit: Troy Baker, an American, uses a British accent when voicing Van Kleiss.
- Follow the Leader:
- A show about a young man who gains superpowers and travels the country/world in a team of three, fighting monsters-hey, wait a minute!
- It's made by the same people; looks like they weren't done with making adventures.
- The series main character, his powers and the title may seem rather familiar for anyone who's seen Generator Gawl, though the overeaching plots of the two series are wildly different.
- And there are many similarities to Cybergeneration - ongoing global nanotech apocalypse, heavy-handed government agencies, and most of the EVOs with human intelligence are teenagers.
- The Other Darrin:
- Peter Meechum was played by Jeff Bennett in his debut, then by Wil Wheaton.
- In his debut episode, Hunter Cain was voiced by John Cena. Ever since, he's been voiced by John DiMaggio. Probably has something to do with the fact that Cena's WWE schedule is pretty time-consuming.
- Playing Against Type:
- John Cena is a goody-goody two shoes. Hunter Cain is his exact opposite.
- Hynden Walch, who usually voices Moes and overly-cutesy characters, voices the insanely creepy Breach.
- Grey DeLisle as Dr. Holiday can be seen as this, considering that she usually voices Jerks With A Heart of Gold, jerks, villains, and morally ambiguous characters.
- Keep Circulating the Tapes: Only the first 9 episodes have ever been released to DVD; thankfully, the entire series is on iTunes and Netflix.note However, there are 2 missing episodes from the "Season 3" batch for some reason on iTunes, leaving the series incomplete on that service. Not only that, but only the episodes in "Season 5" are available to buy in HD for some reason, when the entire series was produced in the format.
- As of mid-2017, the two episodes are now available on iTunes. Still not HD, though.
- Screwed by the Network: The back half of the final season went straight to iTunes, despite network promises that it would actually be aired. It did actually air... ten months later, where it was quickly shown over a few days in the morning, and is still missing two episodes.
- The Wiki Rule: https://generatorrex.fandom.com .
- What Could Have Been:
- Earlier character designs for Rex were much closer to that of the original M. Rex comic.
- The series was originally going to be a shared universe with Man of Action's other Cartoon Network series, Ben 10, but toyline legal issues prevented this from coming to fruition. note The two series would eventually meet in a crossover, but the shared universe idea wouldn't happen until Ben 10 (2016), where younger versions of Rex, Robo, and Agent Six characters appear in one of its final episodes.
Trivia / Generator Rex