Question: How does Cap know that Bucky killed Tony's parents?
Question: When Dr. Strange gets into the accident near the beginning of the film, why didn't his car's airbag deploy? Wouldn't such an expensive car have all kinds of standard safety features?
Chosen answer: The airbag did deploy. However, the deployment occurred when the car first crashed and we see the accident from the outside, so we can't see it. Once we get a shot of the interior, you can see the airbag is sticking out from the steering wheel, but (unlike what some movies would show you) airbags deflate very rapidly after a crash, so you may have missed it.
But if the airbags did deploy, then why did he have such major injuries? Wouldn't the airbags have made what happened to his hands less severe?
I don't think so. I watched it again recently and I think I saw the car's speedometer crush his hands while they were still on the steering wheel, while the airbag deploys from the centre of the steering wheel, nowhere near his hands.
Often in real life, when air bags deploy from the steering wheel, they force the hands off the steering wheel resulting in the hands hitting the windshield. Damage to hands, wrists, and lower arms are common.
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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