* 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.
** Apparently, [[Series/VeronicaMars Lilly Kane]] came BackFromTheDead and now calls herself Karen Smith. Maybe that explains where she got her psychic powers from?
** [[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]] (Ana Gasteyer)
** [[TotalDramaIsland Eva]] was caught making out with a hot dog. And Dave voiced Jason.
** 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/Sunset Shimmer]].
*** 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 ''Series/H2OJustAddWater'' 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.
* PlayingAgainstType: Neil Flynn, who was at this time well known as the [[{{Jerkass}} sarcastic smartass]] Janitor on ''{{Scrubs}}'' plays Cady's loving, caring, affectionate and utterly clueless father.
* ProductionPosse: The movie was produced by ''Series/SaturdayNightLive'' co-creator and producer Lorne Michaels, and written by Tina Fey, who plays a supporting part, and also includes her SNL castmates Ana Gasteyer and Tim Meadows.
* 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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