"Reportedly a scene was filmed where during the final battle Captain America saves an old man trying to protect his grandchildren. He tells him to ‘Get them to cover’ but as he walks away the old man asks him “Cap, is that really you?’. He turns and noting the man’s World War 2 veteran lapel pin trades salutes with him. As Captain America sprints away the children ask their grandfather ‘Do you know him?’ and he replies ‘We ALL know him’."
-Avengers IMdB trivia