* ActorAllusion:
--> '''Iron Man to War Machine''': Stop talking like [[Creator/LeVarBurton you're]] on Reading Rainbow!
** In "Too Many Wolverines", [[Creator/WayneKnight Egghead]] tries to stop Reptil with a can of Dinosaur Spray, only for it spit out whipped cream. This is a nod to Wayne Knight's role as Dennis Nedry in ''Film/JurassicPark'', where he tried to smuggle dinosaur embryos in a can of shaving cream.
* CastingGag: Creator/AdamWest as the Franchise/{{Batman}} {{expy}} Nighthawk, Creator/SusanEisenberg [[WesternAnimation/JusticeLeague as the]] Franchise/WonderWoman expy Power Princess, and [[Series/TheVampireDiaries Nina Dobrev]] as ComicBook/WerewolfByNight's girlfriend, [[spoiler:who gets turned into a vampire]].
** [[Series/HerculesTheLegendaryJourneys Kevin Sorbo]] as Ka-Zar.
* ChannelHop: Reruns went from Creator/CartoonNetwork to Creator/TheHub due to Hasbro's involvement with the Super Hero Squad toyline (though Cartoon Network was also getting rid of Marvel-related content anyway, [[Creator/{{Disney}} for obvious reasons]]).
* ExecutiveMeddling: Despite Disney purchasing Marvel around the time of the show's premiere, Cartoon Network was forced to continue airing the series due to a contractual obligation to Hasbro, who produced the toyline.
* ExiledFromContinuity; Franchise/SpiderMan and related characters weren't allowed to appear on the show because Creator/{{Sony}} still owned the full media rights to Spider-Man when the show was in development. Because Sony didn't relinquish Spidey's animated television rights to Disney yet, the wall-crawler didn't even get to make so much as a cameo in the second season. The closest the series ever gets to acknowledging Spider-Man is having the Mayor of Superhero City mention [[WritingAroundTrademarks a hero who gained super powers from being bitten by a radioactive bug]] in "Election of Evil".
* ScrewedByTheNetwork: When Season 2 started on Cartoon Network, it only aired on Saturday mornings at 6:30 AM. Disney's purchase of Marvel was likely a factor in this.
* TalkingToHimself: There are some characters who share voice actors and interact with one another.
** Creator/TaraStrong voices both H.E.R.B.I.E. and Scarlet Witch.
** Creator/TomKenny voices Iron Man, M.O.D.O.K., and Captain America.
** Creator/CharlieAdler voices Doctor Doom and his mother Coco Von Doom.
** Creator/SteveBlum voices Wolverine and the Abomination.
* WhatCouldHaveBeen: Franchise/SpiderMan was slated to appear in the series during conception, possibly in Falcon's spot, but Creator/{{Sony}} refused due to their ownership of the TV rights to the character at the time. Even after Sony returned the TV rights to Marvel following Disney's acquisition of said company, he still wasn't able to appear at all in the series. The closest we got was in the ''WesternAnimation/UltimateSpiderMan'' episode "Flight of the Iron Spider", which shows a SHS-Spidey in one of Spidey's own {{Imagine Spot}}s as Tony Stark is talking about an invention that can send people into different dimensions [[spoiler:which also serves as a ChekhovsGun as that's how he gets rid of the Living Laser - sending him exactly into ''SHSS'' to be beaten up by Thor]].
** This is somewhat rectified by him (and some other Spider-Heroes) appearing in [[VideoGame/SuperHeroSquadOnline the online game]], which for all intents and purposes is the same universe as the cartoon.
* WrittenByCastMember: Creator/TomKenny co-wrote "Missing: Impossible!"
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