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.
Hollywood Homely: A prominent example is Kai (aka Kaisuke), the necktie-clad biker from Kaneda's gang. Like Tetsuo, he's not drawn in Mr. Fanservice fashion, but a lot of people call him the Bishōnen.
I Am Not Shazam: People who have seen covers for the movie or comic often mistake either Kaneda or Tetsuo for Akira since they are more prominent.
Also, there is a literal example in the first dubbed version of the movie. When Tetsuo hears the name Akira in his head, he shouts "I am not Akira!". This line was changed in later dubs.
And Akira's doomsday cult in the movie think he's Akira after he shows off his powers battling the army, a misconception Tetsuo is in no hurry to correct.
Jerkass Woobie: Tetsuo's had a pretty sucky life. And then he pulled all kinds of shit on others.
Moral Event Horizon: Tetsuo crosses it when he kills Yamagata. Though in the manga it could be as early as when he takes over the Clowns.
He crosses this much earlier in the manga...since Yamagata and Taking over the Clowns happens in volume one. It Gets Worse from there... In the movie meanwhile this happens much later.
Nightmare Fuel: The giant toys in the movie, Tetsuo's mutation and Kaori's fate (among others).
Animation Age Ghetto: Despite that the movie was originally rated PG-13 in the U.S. (With the 2001 redub earning an "R" rating!) you can still find stores that put this in the "family" shelf. Other stores at least put it in the dedicated "Anime" section, leaving it to the person browsing the shelf to at least use their own discretion when searching for stuff to show their children.
Gateway Series: Towards anime. Steven Speilberg had claimed the movie to be Unmarketble in the U.S. due to the Animation Age Ghetto. This movie was rated PG-13 when the first dub hit the screens...in the 80s, this actually stood out a bit.
Harsher in Hindsight: As Tetsuo advances towards the city we see a young man standing down a tank, an anti-government demonstration, government censorship of the media, and the massacre of countless civilians. Remember that the movie was released in 1988. Do you know what happened in China the following year?
Kaneda: "Let's sit down and talk about the Revolution and stuff!"
Kaneda: "Hey, your bike's still burnin', man!"
Manga
Crowning Moment of Awesome: Kaneda running up out of nowhere and punching Tetsuo HARD in the face during their fight at the stadium, before continuing to beat him into submission. See Deface of the Moon.
Crowning Moment of Heartwarming: The last images of the manga, as Kaneda and his surviving friends ride off into the ruins of Neo Tokyo, with memories of their deceased friends Tetsuo and Yamagata riding alongside them, while Neo-Tokyo symbolically rebuilds itself as they progress into it.