* AbilityOverAppearance: Lizzy Caplan almost didn't get the job, as the producers thought she was too pretty to play [[CoolLoser Janis]].
* DawsonCasting: Regina George is played by Rachel [=McAdams=], who was 24-25 at the time of filming. Also, Lacey Chabert and Lizzy Caplan were both 21 when the film was made. Lindsay Lohan and Amanda Seyfried, however, were both teenagers at the time.
* FakeAmerican: Rachel [=McAdams=]. (Canadian)
* HeyItsThatGuy:
** Neil Flynn ([[AlmightyJanitor the Janitor]] from ''Series/{{Scrubs}}'') as Cady's father. It's very disconcerting to see him being nice.
*** Don't worry -- it's part of the mask.
*** And now strangely fitting to the point of being a FunnyAneurysmMoment itself considering his role as Mike Heck in ''TheMiddle''.
** Apparently, [[VeronicaMars Lilly Kane]] came BackFromTheDead and now calls herself Karen Smith. Maybe that explains where she got [[WetSariScene her psychic powers]] from?
*** Must... resist... obvious... ''VideoGame/CommandAndConquer'' joke... arrrrrgh '''[[IncrediblyLamePun LILLY KANE LIVES]]!!!'''
** [[Series/ThirtyRock Liz]] [[TinaFey Lemon]] teaches calculus.
** [[WesternAnimation/TheWildThornberrys Eliza]] [[LaceyChabert Thornberry]] is Gretchen. The same happened in Hungary.
** Regina's mother is [[Series/ParksAndRecreation Leslie]] [[Creator/AmyPoehler Knope]].
** Karen eventually gets [[InTime Justin Timberlake]], Regina gets [[Film/TheNotebook Ryan Gosling]], Gretchen gets [[VideoGame/SonicTheHedgehog2006 Sonic The Hedgehog]], and Cady gets [[Film/TheLoveBug a talking car.]]
** Betsy Heron was [[SaturdayNightLive Martha Stewart]].
** [[TotalDramaIsland Eva]] was caught making out with a hot dog.
** The Hungarian Cast
*** Cady Heron, unlike Brazil, is [[WesternAnimation/TheAmazingWorldOfGumball Nicole Watterson]].
*** Karen Smith is, like in Italy, [[WesternAnimation/HowToTrainYourDragon Astrid]].
*** Gretchen Wieners and Regina George? You can take your pick for this one: [[WesternAnimation/MyLifeAsATeenageRobot Britt and Tiff]]; [[WesternAnimation/JohnnyTest Mary and Susan Test]]; [[WesternAnimation/TotalDrama Izzy and Katie]]; or [[WesternAnimation/MyLittlePonyFriendshipIsMagic demo Applejack and Season 2 Rarity/Diamond Tiara/Trixie]].
*** Damien and Janis Ian are [[Disney/PeterPan John and Wendy Darling]].
** A lot of the actresses in the sequel have been featured on Disney Channel at one point (Save for Creator/ClaireHolt, who was in H20JustAddWater which aired on Nick and TeenNick in the US, but averted in Australia since her show was aired on DisneyChannel Australia). That fact doesn't really help matters.
* WhatCouldHaveBeen:
** In the original script Gretchen was envisaged as plain-to-ugly (with a "sniveling whiny face") and part of the in-crowd solely for her wealth. Obviously this was dropped when the very pretty LaceyChabert was cast in the role but traces of the original perception of the character can still be seen in the film in Regina's obvious surprise that Gretchen was nominated for Spring Fling Queen.
** The film was a lot filthier before it was PG-13ified. See {{Bowdleri|se}}zation on the main page.

!!This film [[ImageSource provides the page image]] for:

* GirlPosse.
* MakeWayForThePrincess

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