people have already answered but i'm going to answer as well because it's an excuse to talk about my hyperfixations (college and bh6), also i mention the series a lot because its gives a lot of lore but technically it's not movie canon
1. yeah reasonably he probably helped out in the cafe (though if i recall correctly he never did in the series). He's not old enough to work in the US until 16 but the cafe is a family business so he's legally allowed to do that. Also San Fransokyo isn't actually a hybrid city and is just normal San Francisco but renamed to honor the Japanese immigrants that helped rebuild the city after the 'great catastrophe' so it's likely solely based on American child labor laws. Hiro graduated high school at 13, so he's been doing nothing besides bot fighting for at least a few months. I doubt that he ever considered his future at that age though.
2 + 3. Oh THIS. Honey Lemon definitely should not be in that lab but also none of them besides Tadashi should be working in there. The nerd lab is in the robotics building and robotics is a subsection of engineering, Tadashi (and eventually Hiro) is the only robotics engineering major. Wasabi should be in the Physics building, Honey Lemon should be in the Chemistry building, Fred should honestly be at his own school like one of them had to let him in because you need your student id to get into buildings. GoGo is the only one I'd let slide being there because she's also an engineering student but even then, she's in mechanical engineering and industrial design which should still not be in the robotics lab, she should be in a design lab which again would be a different building since SFIT is a very big campus.
Back to Honey though, iirc she's just a regular Chemistry major, not Biochem but even so she's not following any type of lab safety. No closed toe shoes, no safety goggles, her hair isn't in a ponytail or back braid, and she put her face way too close to the heated chemicals. I doubt that everything she has is super dangerous though since sometimes you have to use regular old salt or whatever mundane compounds in an experiment and considering how chill she was about her brittle pink tungsten carbide (a safe metal) ball exploding on her skin and clothes, she must have been certain that it's safe.
Her chem purse as a hero? completely different story. that thing is very dangerous for so many chemicals to just be stored in a single bag. Globby from the series proves that considering how easily that stuff could've killed him instead of turning the poor man into a chemically changing slime mutant.
4. That's just how Hiro got in. No university would ever make that their sole admission. The expo was based on the real expos from schools like MIT and the Ivy League's, in these usually current students, grad students, professors, and post grads are showcasing their work to potential employers. The fact that they had the opportunity for high school students and grads to get accepted showcasing their work as well is amazing but in all likelyhood less than five students per year would get in like that.
5. Well going back to the fact that the school is based on renowned schools in the US, yes. most students there are probably from rich families. but a good amount would also be there because of scholarships and considering hiro is a legacy (he's not the first in his family to go there) and how he got accepted i'm certain he recieved a full ride scholarship when callaghan handed him the acceptance letter.
6. San Fransokyo is a very tech advanced city, i doubt it isn't common to have a 3D printer there. Besides based on the villains that we've seen (Callaghan and the villains from the series) almost everyone has their own amazing tech or ways to copy someone else's. There's no need to steal from two teens when you can steal stuff that's way better.
7. she's latina, she has an accent
8. Fires can spread pretty quickly but that one was very likely to have a ton of fuel and was an electrical fire because of all of the projects and chemical inside of it. those were definitely catalysts in the fire which also explains why the building completely exploded so quickly. Callaghan is a stem professor he could most likely tell which project to set on fire to cause the fastest spread.
9. idk some people headcanon that Tadashi and Honey Lemon were a thing considering how happy she was to see him and she's the only one that seemed excited to meet his little brother that 'she's heard so much about'. if he was in a relationship it wouldn't be important to the story though. he seems like the type of guy to focus on education over relationships so
10. i can 100% confirm that when you live in a big city, you do not care about the robot and supervillain that you can hear from your window. also sometimes there are just dead zones in a city that always seem empty at night. they're usually pretty dangerous so i think its safe to assume they were driving somewhere near good luck alley (the place from the bot fight with yama)
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