History YMMV / PhineasAndFerbMissionMarvel

** ''Horse in a Bookcase's'' existence maybe the first full circle example of this trope. As during the [[WesternAnimation/MyLittlePonyFriendshipIsMagic Friendship Is Magic]] episode [[MyLittlePonyFriendshipIsMagicS4E9PinkieApplePie Pinkie Apple Pie]], Pinkie hides in Twilight Sparkle's bookcase and quotes Isabella's famous "[[{{Catchphrase}} Whatcha doin']]" line.

* TheWoobie: As always, Candace, who can't help but screw things up every time she tries to help [[spoiler:(until the end of the episode)]], to the point where the normally cheerful Phineas yells at her several times and revokes her S.H.E.D. membership. She even sings a sad song about her predicament alongside Isabella.

*** Iron Man offers internship to Ferb next summer. Just like [[Film/CaptainAmericaCivilWar a cover-up story for Aunt Meg by Spider-Man and Iron man to go to Germany]]
*** Spider-man tells Phineas that the juice box is on him. Hinting that Spider-Man is also a student. and unknowingly to both of them, [[spoiler: Tony Stark's protege]]

*** Thor said: "Being a hero isn't the armor you wear. But the metal in your spirit and the steel in your resolve". what does a special close credit appeared for Bruce and Tony.

** Has very subtle references to the [[Franchise/MarvelCinematicUniverse]]

* UnconventionalLearningExperience: Though Candace pointing out that energy can never be destroyed is based on her reading of comic books, the rule also applies to real world physics, which children watching this show may not necessarily be familiar with.

* TheWoobie: As always, Candace, who can't help but screw things up every time she tries to help [[spoiler:(until the end of the episode)]], to the point where the normally cheerful Phineas yells at her several times and revokes her S.H.E.D. membership. She even sings a sad song about her predicament alongside Isabella.

* TheyWastedAPerfectlyGoodPlot: Many people feel that Isabella's issues that made her feel useless should've been elaborated on more outside of her song with Candace.

** To a lesser degree, the fact that the girls' BigDamnHeroes moment was largely accidental has drawn some criticism, particularly because the episode was trying to show that [[BrokenAesop females are just as capable as males]].

* UnfortunateImplications: The other supervillains having no qualms about working with Red Skull, considering the whole Nazi thing. He's never called one in-universe, true, but that doesn't mean he isn't one.

** ''Horse in a Bookcase's'' existence maybe the first full circle example of this trope. As during the [[WesternAnimation/MyLittlePonyFriendshipIsMagic Friendship Is Magic]] episode [[MyLittlePonyFriendshipIsMagicS4E9PinkieApplePie Pinkie Apple Pie]], Pinkie quotes Isabella's famous "[[{{Catchphrase}} Whatcha doin']]" line.

* HilariousInHindsight: Prior to the episode's release, many were apprehensive about how the Marvel characters would be characterized. After the special aired, it turned out that it was the characterization of Phineas that was most divisive.

* HateDumb : Since the moment it was announced, some Marvel Fans would consistently complain about how Disney is selling Marvel out.

* ColonyDrop: [[spoiler: The Phineas and Ferb Space Station drop into enemies, but they survive.]]

** To a lesser degree, the fact that the girls' BigDamnHeroes moment was largely accidental has drawn some criticism.

* TheWoobie: Candace, who can't help but screw things up every time she tries to help [[spoiler:(until the end of the episode)]], to the point where the normally cheerful Phineas yells at her several times and revokes her S.H.E.D. membership. She even sings a sad song about her predicament alongside Isabella.

* BaseBreaker: The initial announcement that such a crossover would happen, though the episode has mostly been well-received now that it has been released (at least among more casual viewers).

* BaseBreaker: The initial announcement that such a crossover would happen, though the episode has mostly been well-received now that it has been released.

* TheWoobie: Candace, who can't help but screw things up every time she tries to help [[spoiler:(until the end of the episode)]], to the point where the normally cheerful Phineas yells at her several times and revokes her S.H.E.D. membership. She even sings a sad song about her predicament alongside Isabella.