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.
Trivia: In the comics, a group of celebrity superhuman vigilantes tried to take down a house of super-villains on television, but one of the villains escaped due to the vigilante's incompetence and blew up a school, killing hundreds of children. At the memorial, which Stark attended, a woman accused him of letting it happen (although he had nothing to do with it), leading him to support the act so that such reckless acts of heroism would not happen again.
Trivia: After Tony blows off Bucky's arm, Cap picks up his shield and shields himself from Tony's blasts. At the very end of the shot, Tony is firing a beam at Cap which lands on Cap's shield and the shot begins to slow down. This moment from the shot is an homage to the cover from part 7 of the Marvel Civil War comic storyline, where Captain America and Iron Man are fighting on the front cover in the same way. (02:07:00)
Trivia: In the comics Tony Stark and Reed Richards worked to design a superhuman prison known as Prison 42, which was made specifically for super humans who disobeyed the Registration Act. It was top secret and was used to hold many of those on Team Cap about halfway through the arc. Captain America later broke his teammates out of the prison.
Trivia: Sharon Carter says a eulogy at her aunt Peggy's funeral, with the quote from Peggy, "your job is to plant yourself like a tree and say no, you move." This line is actually an iconic quote from the newer Captain America comics, and is said by Captain America, not Peggy Carter. The quote was said in Amazing Spider-Man #237, published in 2007.
Trivia: While the accident in the film that kicks off the Civil War is the explosion in Wakanda, in the comics, the disaster was a villain named Nitro who exploded near an American school. Tony was also confronted at a memorial rather than a university convention.