These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Award Snub: Or rather, Nomination Snub. After a limited theatrical release, FUNimation attempted to submit Summer Wars for an Academy Award, but, due to the fact that there were less than 16 entries submitted that year, only three nominations were allowed instead of five as the Academy policy dictates, and Summer Wars was not chosen.
Crack Pairing: The pairing of Riichi (the uncle in the Self Defense Force) and Wabisuke grew immensely popular on Pixiv and elsewhere despite the fact that the two are never shown directly interacting with each other.
Kazuma, along with his avatar King Kazma, has quite a lot of fanart; enough to get a spin off manga .
The series's resident Badass Grandma Sakae, who was so awesome that her eventual death due to Love Machine's meddling not only hit the Jinnouchi clan rather hard in the heart, but also anyone and everyone who watched the film.
"Funny Aneurysm" Moment: The climax of the movie prominently features a Japanese asteroid sample-return probe being hijacked by Love Machine and set on a re-entry profile that will destroy a nuclear power plant. The Japan Aerospace Exploration Agency's Hayabusa mission was a similar asteroid sample return probe which did return to Earth in the summer of 2010, and which did experience failures leading to a barely-controlled crash-landing in Australia.
Harsher in Hindsight: Love Machine makes plans to drop a satellite on top of a nuclear power plant, which draws disturbing parallels to Fukushima reactor incident.
In one scene, a character uses his DSi to connect to OZ. Around 1 1/2 years later after this movie came out, Pokémon Black and White had the Global Link, which allowed the players to connect online with any DS (not just DSi) to unlock new Pokémon and items, and even sign up for Online Tournaments around the world.
Idiot Plot: Oz is basically designed so that if you can hack it, the world is pretty much your playground.
Superlative Dubbing: A lot of people absolutely LOVE the English dub for its voice choices and no awkwardness at all.
Suspiciously Similar Song: 'Overture of the Summer Wars' is a heterogeneous piece of music that includes a just-barely-changed sample from Ralph Vaughan Williams's suite 'The Wasps'.
The Untwist: The mastermind behind the Love Machine is none other than the shady Black Sheep of the Jinnouchi family, Wabisuke.
Viewer Gender Confusion: Kazuma's character design and voice are so feminine that many an audience mistook him for a young girl when he first appeared.
What an Idiot: The more tech-savyy and security-savvy viewers will no doubt be wondering at the sheer insanity of putting everything major in the world (including, say, missile access) on a single network. Even if things like banking and mass-communicating are already online, the idea that the loss of one network could bring the whole world (it's indicated to not just be Japan, at least) to a standstill is something most developers would never okay, but thanks to the way that people are linking together all of their accounts with Facebook, Google, and so on, we do seem well on our way to create a sort of meta-OZ where breaking into one system effectively gives you access to everything, even if not directly.