* AllAnimationIsDisney: He has never worked for Disney. Despite this, there are a few products out there which have a similar style to his, which is where the confusion comes from. Most of the products were made by former workers of Spumco (or people inspired by Spumco) such as ''{{Flintstones}}: On the Rocks'', ''TheHauntedWorldOfElSuperBeasto'', ''TheLooneyTunesShow''. The list could go on.
* NeverLiveItDown: He has deeply regretted some of the decisions he made in his works, such as his use of ) shaped eyes (which he only meant for the storyboards and never actually wanted them in the final cartoons) as well as many of the mistakes he made in his cartoons, such as one scene of Stimpy's eyes defying proper perspective (which was a sloppy mistake, but "everyone thought it was on purpose") and claiming that many TV cartoons had made "whole styles out of his mistakes."
* ScapegoatCreator: He is largely blamed for the failure of ''RenAndStimpy: [[DarkerAndEdgier Adult]] [[HotterAndSexier Party]] [[RatedMForMoney Cartoon]]'', with fans claiming that [[ProtectionFromEditors he got too much creative freedom]] on the latter which "ruined" the show--even though John has pointed out that the show still went through ExecutiveMeddling and censorship (this time, through Spike TV instead of Nickelodeon, though both channels are owned by Viacom, so it's really a case of "same shit, different dump"), forcing him to put in excessive adult humor to compete with ''WesternAnimation/SouthPark'' (though, at the time, ''South Park'' was at that point where it was mixing in social commentary with its gross-out humor and taking it beyond fart jokes from the 1990s) and AdultSwim (which doesn't really delve in gross-out humor. AdultSwim's humor is laden with pop culture references, DeadBabyComedy, and/or bizarre, non sequitur humor).