Captain America: Civil War - 16 Things We Learned From The Directors' Commentary
4. Giant-Man Was Almost Cut!
Unthinkably, one of the best sequences in the entire movie almost didn't make it because of outside meddling.
The writers were apparently asked to take Giant Man out. They don't actually say who by, but the smartest money would be on the Ant-Man and The Wasp team who wanted to withhold the BIG reveal for their own movie.
The creative team explored other options for the distraction, including something as simple as exploding fuel trucks, but the dug their heels in and were eventually allowed to use him.