Continuity mistake: In the first Avengers briefing with the Secretary, the shot has Tony Stark sitting in the back with a wedding ring on. The shot changes to another view and Tony is sitting in the same location, but is no longer wearing a wedding ring. This continues many times within the scene.
Captain America: Civil War (2016)
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More mistakes in Captain America: Civil War
Bucky Barnes: [Webbed down after the Falcon got rid of Spider-Man.] You couldn't have done that earlier?
Sam Wilson: [Also webbed down.] I hate you.
Trivia: The directors have previously worked on both Community and Arrested Development - both shows get nods in this movie. Jim Rash, the Dean from Community, plays an MIT faculty member at the start. More subtle is the Bluth family's stair-car from Arrested Development, seen briefly as Captain America walks onto the airport runway before the big battle with the other Avengers.
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.
Phaneron ★