Question: How does Cap know that Bucky killed Tony's parents?
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: 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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