Continuity mistake: After Falcon's drone shoots the man with the vial, it begins to fall to the ground and Black Widow catches it. In the close-up shot, the lid is in the palm of her hand, but when she gets up the vial has turned around, with the lid now above her hand. (00:11:00)
Trivia: Stan Lee makes a cameo at the end of the movie as the FedEx man who says "Are you Tony Stank?"
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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