* HeyItsThatVoice: Creator/{{Funimation}}'s dub pulled out an all-star cast for the film.
** Apparently when [[Creator/ToddHaberkorn Watanuki]] isn't being [[strike:Noriko Jinnouchi]] [[strike:Riza Hawkweye]] [[Creator/ColleenClinkenbeard Yuuko's]] slave, he's doing service on OZ with [[MichaelSinterniklaas Dean Venture]]
** [[Creator/MonicaRial May Chang]] really likes baseball. And while we're on ''[[Manga/FullmetalAlchemist Fullmetal Alchemist: Brotherhood]]'', this troper thinks that [[MaxeyWhitehead Kazuma Ikezawa]] sounds like some one who might have [[Manga/FullmetalAlchemist spent a lot of time in a suit of an armor.]] And [[Creator/CaitlinGlass Nana Jinnouchi]] apparently has a hidden skill in [[SchizoTech Automail Mechanics.]]
** [[SoulEater Crona]] [[MegatonPunch FALCON-PUNCHED]] Love Machine. Amazing~!!!!
** And yet AGAIN with FMA, [[AnastasiaMunoz Gracia Hughes]] as Noriko Jinnouchi. [[BarryYandell Doctor Mansaku Jinnouchi]] was also [[Manga/FullMetalAlchemist Yuki]]. Apparently xxxHoLic and Fullmetal Alchemist was a theme in choosing VAs for the dub.
*** Rather minor one but worth noting that the kid with the bowl haricut is [[Manga/FullmetalAlchemist Pride]]
** Natsuki's [[Creator/BrinaPalencia English voice]] sounds like [[LightNovel/SpiceAndWolf Holo]] and [[Manga/{{Claymore}} Priscilla]].
*** Which is fitting that Uncle Wabisuke is also [[SpiceAndWolf Kraft Lawrence]].
*** And he [[{{InitialD}} drives a white Mazda RX-7...]]
*** Natsuki looks ''and'' sounds a lot like [[BirdyTheMighty Nakasugi]].
*** Not to mention, [[AxisPowersHetalia France]] lied about looking at women with big boobs
** Apparently [[SoulEater Dr. Stein]] does military work in his spare time...
** Not to mention [[AxisPowersHetalia Germany]] works for the Fire Department~!
** Watching the dubs for ''[[RebuildOfEvangelion Evangelion 2.22]]'' and ''Summer Wars'' in the same day is an... interesting experience, especially when you realize that both films have a suave, unkempt character of dubious political allegiance who not only [[YoshiyukiSadamoto look]], but now [[Creator/JMichaelTatum sound]] extremely similar. Not to mention [[Creator/BrinaPalencia Rei]] seems a lot more chipper all of a sudden, and Listen closely and you might hear [[Creator/TrinaNishimura Mari]] somewhere in the background too.
** [[YuYuHakusho Hiei]] and [[BlackBloodBrothers Jiro]] were in there somewhere as well.
** And in the Italian dub, Natsuki is [[WesternAnimation/MyLittlePonyFriendshipIsMagic the faithful student of Princess Celestia]].
*** Which becomes HilariousInHindsight for Italian fans because both characters [[spoiler: get an upgrade from a certain guardian]].
* If you pause to read the list of people who solved the initial encryption for Love Machine, you'll find quite a few real-world notable mathematicians.
** And quite a few European [[TheBeautifulGame footballers]] such as Robin Van Persie and Andrei Arshavin (I have no idea why).
* If you also pause during the combats in the virtual battleground (in particular right after Kazuma's first defeat, which has a good still image) you can see the tournament inscription ends with "...FOR THE GLORY OF THE INTERNETS".
* SpiritualSuccessor: of ''[[Anime/DigimonAdventure Our War Game]]''.
* WhatCouldHaveBeen: News revealed that ''Summer Wars'' was rejected by Creator/WarnerBros... in which case, an entirely new dub would've had to be made! Who knows how much the chances of an Oscar nomination would've changed if that had happened!
* XMeetsY: WarGames meets MegaManBattleNetwork
** Or, ''A Walk in the Clouds'' meets ''{{Neuromancer}}''.
* The movie was aired on {{Creator/Toonami}} as part of a Month of Movies event on December 2013.
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