History YMMV / PhineasAndFerbTheMovieAcrossThe2ndDimension

** Existentialism trading cards!
*** "I'll trade you two Kafkas for a Dostoevsky." From Buford!

* TheyWastedAPerfectlyGoodPlot: What? No Vanessa (Original and Parallel) and/or Parallel Stacy? No Parallel Stacy is even more of one when you realize that [[spoiler:her absence is justified since Parallel Candace's "growing up" so fast probably made it so that she never met her world's Stacy, which makes the plot an even bigger waste because Original Candace and Stacy never bring that up or reflect on it.]]
** In a way, they already used that plot with Parallel Jeremy (While she ''did'' meet him, she thought of him purely as a soldier, rather than a possible friend or boyfriend like she would have had she not had to grow up so fast.) Throwing in the same thing with Stacy would have wasted time without adding much.
** And there ''was'' going to be a few scenes with both original and parallel Vanessa, but they had to cut them out due to timing. You can watch said deleted scenes on the DVD. [[AuthorsSavingThrow Alleviated]] in the sequel episode, in which a major part of the episode continues off of parallel Vanessa's missing scene.

** Ferb's role is pretty downplayed, and he doesn't really respond to the fact that Perry has (to their information) betrayed him just as much as Phineas. Similarly, he doesn't do much in the final battle, showing up after everything is already done.

* HarsherInHindsight: The 2nd dimension deals with kids stuck at home that can't hang out with friends, guess what happened in 2020?

* FanonDiscontinuity: In fanfic-writing circles, it's not uncommon for the ending to be reversed or flat-out ignored. It isn't that people don't like it ([[BrokenBase though plenty of fans didn't]]), but that its ResetButton ending keeps them from exploring so many interesting ideas and premises.

%%* BigLippedAlligatorMoment: "Brand New Best Friend", [[Administrivia/TropesAreTools as entertaining as it is]], is still a ''major'' BLAM.
* BrokenBase:

** Phineas' characterization in the movie proved to be divisive. Phineas is almost never upset or angry ([[Recap/PhineasAndFerbSummerBelongsToYou GET ON THE TRIKE!!]] notwithstanding); here, he's mad at Perry for half the movie's run time. It's presented as OOCIsSeriousBusiness (he believes his entire bond with his beloved pet was a lie), but to some fans, it came across as cruel, unwarranted, and thoroughly un-Phineas-like.

%%* BigLippedAlligatorMoment: "Brand New Best Friend", [[TropesAreNotBad as entertaining as it is]], is still a ''major'' BLAM.

* AlternativeCharacterInterpretation: Did Doofenshmirtz-2 really turn evil because he [[FreudianExcuse lost that toy train]]? Or did he have a past so unbelievably traumatic that he blocked it out, and funnels all those negative emotions into the loss of his beloved childhood toy? Or was he a horrible person [[EnfanteTerrible even as a kid]] and is just using the train as an excuse?

* BigLippedAlligatorMoment: "Brand New Best Friend", [[TropesAreNotBad as entertaining as it is]], is still a ''major'' BLAM.
* BrokenBase: While this is for the most part averted regarding the actual movie, [[StatusQuoIsGod the ending is a different matter...]].
** More specifically, Phineas' characterization in the movie proved to be divisive. Phineas is almost never upset or angry ([[Recap/PhineasAndFerbSummerBelongsToYou GET ON THE TRIKE!!]] notwithstanding); here, he's mad at Perry for half the movie's run time. It's presented as OOCIsSeriousBusiness (he believes his entire bond with his beloved pet was a lie), but to some fans, it came across as cruel, unwarranted, and thoroughly un-Phineas-like.

* GeniusBonus: Or, perhaps, Liberal Arts Major Bonus - Norm's "Get me! I'm a Georgia O'Keeffe painting!"

%%* HilariousInHindsight: For years, there have been tons of fan art and fan videos on Website/YouTube showing Phineas and Isabella kissing. Then this movie comes and does it for real.
%%This is not an example of HilariousInHindsight.
* SugarWiki/MostWonderfulSound: Isabella finally planting one on Phineas.

* TheProblemWithLicensedGames: Quite successfully averted. The video game adaptation of this film is not only very enjoyable to play, but also has all the original voice actors, humor that could have come straight out of the show itself, and a [[SugarWiki/AwesomeMusic seriously cool song to go with it]].

** Unless, of course, you're [[MostAnnoyingSound NOT a Phinbella fan]].

* UnintentionallyUnsympathetic: People are supposed to feel bad for Phineas when he's understandably angry at Perry for keeping his identity a secret, but he comes off as an ungrateful {{Jerkass}} who cruelly disowns Perry by kicking him out into the cruel, cold world and entering the house like nothing happened.

* UnintentionallyUnsympathetic: People are supposed to feel bad for Phineas when he’s understandably angry at Perry for keeping his identity a secret, but he comes off as an ungrateful {{Jerkass}} who cruelly disowns Perry by kicking him out into the cruel, cold world and entering the house like nothing happened.

* UnintentionallyUnsympathetic: People are supposed to feel bad for Phineas when he’s understandably angry at Perry for keeping his identity a secret, but he comes off as an [[UngratefulBastard ungrateful]] {{Jerkass}} who [[KickTheDog cruelly disowns Perry by kicking him out into the cruel, cold world]] and entering the house like nothing happened.

* UnintentionallyUnsympathetic: People are supposed to feel bad for Phineas when he's understandably angry at Perry for keeping his identity a secret, but he comes off as an [[UngratefulBastard ungrateful]] {{Jerkass}} who [[KickTheDog cruelly disowns Perry and kicks him out into the cold, cruel world]], and then enters the house like nothing happened.

* AlternativeCharacterInterpretation: Did Doofenshmirtz-2 really turn evil because he [[FreudianExcuse lost that toy train]]? Or did he have a past so unbelievably traumatic that he blocked it out, and funnels all those negative emotions into the loss of his beloved childhood toy? Or was he a horrible person [[EnfanteTerrible even as a kid]] and is just using the train as an excuse? [[labelnote:*]] The train was most likely taken away ''because'' he was such a horrible person during youth. The other Doof has it because he was ''not'' a horrible person during youth. [[/labelnote]]

* UnintentionallyUnsympathetic: People are supposed to feel bad for Phineas when he's understandably angry at Perry for keeping his identity a secret, but he comes off as an ungrateful {{Jerkass}} who cruelly disowns Perry and kicks him out into the cold, cruel world and entering the house like nothing happened.

%%* HilariousInHindsight: For years, there have been tons of fan art and fan videos on YouTube showing Phineas and Isabella kissing. Then this movie comes and does it for real.

* MostWonderfulSound: Isabella finally planting one on Phineas.

** Then the sound of the Amensia-Inator hitting would a MostWonderfulSound, for those who aren't Phinabella fans.
* TheProblemWithLicensedGames: Quite successfully averted. The video game adaptation of this film is not only very enjoyable to play, but also has all the original voice actors, humor that could have come straight out of the show itself, and a [[AwesomeMusic seriously cool song to go with it]].

* AlternativeCharacterInterpretation: Did Doofenshmirtz-2 really turn evil because he [[FreudianExcuse lost that toy train]]? Or did he have a past so unbelievably traumatic that he blocked it out, and funnels all those negative emotions into the loss of his beloved childhood toy? Or was he a horrible person [[EnfanteTerrible even as a kid]] and is just using the train as an excuse? [[labelnote:*]] The train was most likely taken away ''because'' he was such a horrible person during youth. [[/labelnote]]

* AlternativeCharacterInterpretation: Did Doofenshmirtz-2 really turn evil because he [[FreudianExcuse lost that toy train]]? Or did he have a past so unbelievably traumatic that he blocked it out, and funnels all those negative emotions into the loss of his beloved childhood toy? Or was he a horrible person [[EnfanteTerrible even as a kid]] and is just using the train as an excuse? [[note]] The train was most likely taken away ''because'' he was such a horrible person during youth. [[/note]]

* AlternativeCharacterInterpretation: Did Doofenshmirtz-2 really turn evil because he [[FreudianExcuse lost that toy train]]? Or did he have a past so unbelievably traumatic that he blocked it out, and funnels all those negative emotions into the loss of his beloved childhood toy? Or was he a horrible person [[EnfanteTerrible even as a kid]] and is just using the train as an excuse? (The train was most likely taken away ''because'' he was such a horrible person during youth.)

* UnintentionallyUnsympathetic: People are supposed to feel bad for Phineas when he's understandably angry at Perry for keeping his identity a secret, but he comes off as an [[UngratefulBastard ungrateful]] {{Jerkass}} who [[KickTheDog cruelly disowns Perry and kicks him out into the cold, cruel world]] and entering the house like nothing happened.

* AlternativeCharacterInterpretation: Did Doofenshmirtz-2 really turn evil because he [[FreudianExcuse lost that toy train]]? Or did he have a past so unbelievably traumatic that he blocked it out, and funnels all those negative emotions into the loss of his beloved childhood toy? Or was he a horrible person [[EnfanteTerrible even as a kid]] and is just using the train as an excuse?

* UnintentionallyUnsympathetic: People are supposed to feel bad for Phineas when he's understandably angry at Perry for keeping his identity a secret, but he comes off as an ungrateful {{Jerkass}} who cruelly disowns Perry and kicks him out into the cold, cruel world and entering the house like nothing happened.

* JustForFun/XMeetsY: The basic plot of this movie is the usual Phineas and Ferb A-Plot coming into contact with the Agent P B-Plot.

** And there ''was'' going to be a few scenes with both original and parallel Vanessa, but they had to cut them out due to timing. You can watch said deleted scenes on the DVD.

* WhatAnIdiot: Our Doof once built an army of robots just like Doof-2, except he 1) installed self-destruct switches and 2) placed them on the bottom of their feet so no one would be able to reach them. One step later and...

* HilariousInHindsight: For years, there have been tons of fan art and fan videos on YouTube showing Phineas and Isabella kissing. Then this movie comes and does it for real.

* WhatAnIdiot: Our Doof once built an army of robots just like Doof-2, except he 1) installed self-destruct switches and 2) placed them on the bottom of their feet so no one would be able to reach them. One step later and...

* EnsembleDarkhorse: Of all the 2nd dimension characters, Candace-2 is the most loved. No surprise if you consider that she is a {{Badass}} ActionGirl and just about everything she does is a moment of awesome.