Question: How does Cap know that Bucky killed Tony's parents?
Question: After Bucky explained about all the other Winter Soldiers, Sam says 'This would have been a lot easier a week ago' but what difference would it have made if it was a week ago?
Chosen answer: Because the U.N. has been preparing to pass the Sokovia Accords and they want to oversee the Avengers. A week earlier, the Avengers would not have had to seek permission to find the other Winter Soldiers (or wait while the oversight committee makes a decision). As a result of the U.N. Sanctions, Captain America and Sam Wilson have to go rogue in order to find the other soldiers. (Their actions of going rogue result in Iron Man and his team in hunting the rogue Avengers down, creating a "civil war").
Question: As I always understood Ant-Man, he always retained the same mass, regardless of his physical size. When he reduces his size, he still retains about 160 lbs of mass, which makes him more formidable, like a 160 lb grain of sand. When he enlarges, even to gigantic size, he is still only 160 lbs. So, how can he kick vehicles around in the airport scene?
Chosen answer: We never get a specific explanation to what happens to him when he enlarges. Hank Pym explains to him that when he shrinks, it's the result of reducing the distance between atoms which is why he retains his original mass. However, being a giant with a mass and strength of only 160lbs would not be very advantageous in a fight, so they must have found a way for him to grow in size and strength in this situation. Ultimately, we just don't know - the movies and comics differ in a great many respects, so there's just not enough information to work with. Might technically qualify as a mistake, but it's something which could easy be solved with an in-universe answer, however scientifically dubious.
Question: Why would Tony be supportive of the SRA? In the first movie he revealed himself as Iron Man. In turn, he was attacked at the speedway by Vanko and almost got Happy and Pepper killed in the second movie. In the third movie, Happy is in a coma in the hospital, his Malibu home was leveled and Pepper was captured and injected with Extremis. Shouldn't this have opened Tony's eyes that by exposing his identity to the public, that he's now put himself and his friends in danger 24/7?
Answer: In the film, what is being proposed is the "Sokovia Accords", which would regulate the Avengers, but wasn't a registration act. Tony supports this because he feels responsible for creating Ultron and does think he (and the others) need to be regulated. In the comics, Tony supports the Superhuman Registration Act (SRA) because he foresees the possibility that an unregistered superhuman will cause so much destruction that the government will come down even harder on all superhumans, such as imprisonment or execution, rather than simply registering them. Tony is hoping that by showing support of the SRA, they can work with the government to moderate the act so that the community isn't harmed by it and that it will have a minimal negative effect, and to make sure everyone's secret identities are not revealed to the public.
Question: Why is Tony Stark's attitude a complete 180 in this film? He's usually one to be against authority, but in this film he's for it.
Answer: He has witnessed the results of his previous actions, and has gone into a deep depression. Between creating Ultron and thus causing countless civilian deaths and causing great trauma for the Avengers, to having to go on a break with Pepper... he's in pain and is seeing his actions come back to bite him. He's become obsessed with trying to fix his mistakes, and thus is giving into authority and trying to keep the team in-check as much as possible to avoid future disaster.
Answer: A mother, played by Alfre Woodard, approaches Tony and tells him her college age son was one of the innocent victims that died from the events in Avengers: Age of Ultron. She made him feel guilty and ashamed.
Question: How did Tony know about Spiderman's real identity?
Chosen answer: He's a multimillionaire with unlimited resources. He probably had his AI do some digging - facial recognition on the picture/video he had?
As evidenced in "Iron Man 3", Tony can easily access GPS, satellite imagery, files, etc. and be able to investigate events even better than the authorities. (Remember that he was able to create an accurate 3D map of the Chinese Theater bombing and work it out when nobody else could.) He very likely was able to use the information available to deduce Parker's identity by tracing his steps, noticing patterns, working out likely candidates, etc., even though nobody else could.
Question: The moment the United Nations van bomb goes off, you can see what appear to be tracks on the rooftops of the buildings. Those look to be the kind of tracks that they maneuver moving cameras on when they film. What are those really?
Answer: Those are track systems for window washers. A cart on the track suspends the window-washing scaffolding over the side and can be moved over the track for a thorough clean.
Question: Why weren't Thor and Hulk in Civil War? If they would've been in the movie, whose side would they join and why?
Answer: Most likely due to the events of Thor: Ragnarok. At the end of Age of Ultron Hulk/Banner disappears because he doesn't want to be involved in the fight anymore. Thor was in London with Jane but we don't know what he was up to. If they were to choose sides they both probably would have been on Cap's side. Banner doesn't want to be used as a weapon and Thor wants to protect Earth without being told what to do.
Question: When Steve Rogers and Black Widow are secretly chatting to each other after the conference bombing, what brand of cellphones are they using?
Chosen answer: Vivo V3.
Question: How did the UN bombing kill King T'Chaka, but leave T'Challa only somewhat hurt? Since both were nearest the windows and, therefore, roughly equally nearest all the flying glass and shrapnel when they got caught in the bomb blast, wouldn't it have been enough to kill them both?
Answer: T'Chaka is significantly older (implied to be at least in his 60s if not 70s), and thus his body is much more frail. Something that might not hurt or kill a younger, more able-bodied person can absolutely hurt or kill an elderly man or woman. (That's why it's such a big deal if an old person suffers a bad fall.) We also know for sure that T'Challa was under the influence of the "heart shaped herb" that gives him enhanced abilities by this point in time, whereas we do not know whether T'Chaka was still under the herb's influence. It's entirely possible that when T'Challa became the Black Panther, T'Chaka's powers were stripped, since there is only one Black Panther at a time.
Question: What was the whole point of the conversation between Cap and Spidey saying where they're from?
Answer: It's just the irony that 2 people are fighting each other whilst feeling connected they are from the same city.
This is also Captain America's way of letting Peter know there are no hard feelings. He understands Peter doesn't have all the facts, so he doesn't blame him.
Question: Was there a deleted scene where Clint tells Cap that he is definitely retired this time?
Answer: In Captain America Winter Soldier, when Cap and Widow are in the military bunker that has the mind of Zola in it, some images flash across the screen that Cap can see. One of them actually shows links to Winter Soldier and Tony's parents. It's not concrete, but not too difficult to put together for Cap and he deduces things on his own. As well as his time talking with Bucky who does claim to remember them all.
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