History YMMV / ScoobyDooMonstersUnleashed

** The BigBad using a disguise as [[spoiler:a woman to further his plans]] would be reused by [[WesternAnimation/TeenTitansGoToTheMovies another Warner Bros. property]], and then again to [[MemeticMutation memetic effect]] in [[WesternAnimation/Scoob yet another]].

* CriticalDissonance: Although still panned by audiences and fans, it was considered a [[SurprisinglyImprovedSequel Step up from the original]] for various reasons. Despite this, it got even worse reviews than the original.

* GeniusBonus: If you listen closely to Scooby at the end, he is seen saying "Mary Jane is a man in a mask", which is what he said in the first film.
* ItWasHisSled: [[spoiler: Jonathan Jacobo is still alive and IS Heather-Jasper Howe.]]

** The BigBad using a disguise as [[spoiler:a woman to further his plans]] would be reused by [[WesternAnimation/TeenTitansGoToTheMovies another Warner Bros. property]].

** "Who's your mommy?" "...Mommy?"

* {{Sequelitis}}: Many critics at the time of it's release considered it inferior to the first one.

** Realistically, this might be the best way to take the film by nonfans, or people older than kid age. It's been pointed out in places, most recently by the WebVideo/NostalgiaCritic, that the film actually has a decent amount of comedic potential, it's just that the actors didn't have the comedic potential to make it all work that well, or maybe got poor direction, despite the fact that Creator/JamesGunn wrote the script.

** The film concerns monster costumes being brought to life. At the [[BadGuyBar Faux Ghost,]] we meet the men and women behind those costumes, but none of them, not even Old Man Wickles, acknowledges that their alter-egos have come to life.

** Shaggy and Scooby accidentally create ''more monsters'' while randomly screwing around with a machine they knew nothing about. Granted, they didn't ''know'' it made monsters, but they've done this song and dance enough to know better than to mess with that sort of stuff now.
* WhatDoYouMeanItsForKids: Fred is tricked into saying "sucks" with one instance of "crap" said by the Black Knight. It's still more family-friendly than the first film.

* FetishFuel: This movie has a lot of it in very strange ways.
** Shaggy with breasts comes up.
** Velma in the Latex spysuit.
** For some, [[spoiler: the DramaticUnmask of Heather-Jasper Howe, an attractive woman, into the homely in comparison Jonathan Jacobo would interest people into masking, or those who find arousal in a man perfectly imitating a woman.]]

** For some, [[spoiler: the DramaticUnmask of Heather-Jasper Howe, an attractive woman, into the homely in comparison Jonathan Jacobo would interest people into masking, or

* ValuesResonance:
** The film depicting Alicia Silverstone as a shady reporter didn't have much of an effect in 2004, but by the late 2010s, especially following the presidential election of the ''extremely'' controversial Donald Trump, the film showed an accurate representation of fake news according to this [[https://friendsonflicks.com/2017/02/21/what-donald-trump-and-scooby-doo-2-monsters-unleashed-have-in-common/ article]].
** The film also accurately depicted cancel culture towards Mystery Inc after Heather Jasper Howe took Fred's words out of context.

* {{Narm}}: Some of the unnecessary [[WereStillRelevantDammIt references to hip hop]].

* ValuesResonance: The film depicting Alicia Silverstone as a shady reporter didn't have much of an effect in 2004, but by the late 2010s, especially following the presidential election of the ''extremely'' controversial Donald Trump, the film showed an accurate representation of fake news according to this [[https://friendsonflicks.com/2017/02/21/what-donald-trump-and-scooby-doo-2-monsters-unleashed-have-in-common/ article]].

* AlternateJokeInterpretation: Did Ned and Heather Jasper Howe/[[spoiler:Dr. Jonathan Jacobo]] cuddle with each other [[spoiler:or was it just an act]]?

* NightmareFuel: [[spoiler: The Tar Monster nearly ''drowning'' the gang in his tar.]]

* ValuesResonance: The film depicting Heather-Jasper Howe as a shady reporter didn't have much of an effect in 2004, but by the late 2010s, especially following the presidential election of the ''extremely'' controversial Donald Trump, the film showed an accurate representation of fake news according to this [[https://friendsonflicks.com/2017/02/21/what-donald-trump-and-scooby-doo-2-monsters-unleashed-have-in-common/ article]].

* TheyWastedAPerfectlyGoodPlot: When Velma discovers an altar dedicated to Jonathan Jacobo, it is easy to conclude that [[spoiler:Heather is the Doctor's former lover, who is trying to get revenge on Mystery Inc. for his death]]. Nope, as it turns out [[spoiler:Jacobo is the one who built the altar to stroke his massive ego, and was actually posing as the female reporter this entire time]]. What would be a perfectly reasonable motivation for the villain is thrown out of the window for the sake of making one bad joke.

** Creator/MatthewLillard would eventually return to his role as Shaggy in [[WesternAnimation/ScoobyDooMysteryIncorporated future Scooby-Doo stories]].

* TookTheBadFilmSeriously: Creator/MatthewLillard seems to be the only one trying to convince the viewers that he's Shaggy.

* ValuesResonance: The film depicting Heather-Jasper Howe as a reporter didn't have much of an effect in 2004 but by the late 2010s after Donald Trump got elected, the film showed an accurate representation of fake news according to this [[https://friendsonflicks.com/2017/02/21/what-donald-trump-and-scooby-doo-2-monsters-unleashed-have-in-common/ article]].

** [[spoiler: Heather Jasper-Howe's UnsettlingGenderReveal.]]

** [[spoiler:The BigBad using a disguise as a woman to further his plans]] would be reused by [[WesternAnimation/TeenTitansGoToTheMovies another Warner Bros. property]].

* CaptainObviousReveal: [[spoiler: Alicia Silverstone's character Heather Jasper-Howe being the BigBad. You have to admit, a famous celebrity playing a supporting character in a ''Scooby-Doo'' movie would definitely tip a few people off]].

* FanonDiscontinuity: Inverted. The first movie was pretty much not mentioned at all in the second film, which made hardcore fans extremely happy.

* HamAndCheese: Creator/TimBlakeNelson as Jonathan Jacobo, Creator/PeterBoyle as Old Man Wickles, and Alicia Silverstone as Heather Jasper Howe ham it up to the best of their abilities, and are clearly having a blast doing it.

* HamAndCheese: Tim Blake Nelson as Jonathan Jacobo, Peter Boyle as Old Man Wickles, and Alicia Silverstone as Heather Jasper Howe ham it up to the best of their abilities, and are clearly having a blast doing it.

** The cast for the Scooby Gang would go on to mock their roles in ''WesternAnimation/RobotChicken'' along with Seth Green.

** Realistically, this might be the best way to take the film by nonfans, or people older than kid age. It's been pointed out in places, most recently by the WebVideo/NostalgiaCritic, that the film actually has a decent amount of comedic potential, it's just that the actors didn't have the comedic potential to make it all work that well, or maybe got poor direction, despite the fact that James Gunn wrote the script.

** Creator/MatthewLillard seems to be the only one trying to convince the viewers that he's Shaggy.

** Shaggy and Scooby accidentally create ''more monsters'' while randomly screwing around with a machine they know nothing about. Granted, they didn't ''know'' it made monsters, but they've done this song and dance enough to know better than to mess with sort of stuff now.

* TheyWastedAPerfectlyGoodCharacter: The film concerns monster costumes being brought to life. At the [[BadGuyBarFaux Ghost,]] we meet the men and women behind those costumes, but none of them, not even Old Man Wickles, acknowledges that their alter-egos have come to life.