Factual error: When Magneto enters RFK stadium, a groundskeeper is lining a baseball field. RFK stadium did not host baseball in 1973, as the Washington Senators had moved to Texas to become the Texas Rangers after the 1971 season. In 1973, the only team playing in RFK regularly was the Washington Redskins of the NFL. In addition, the Paris Peace Accords were signed in January of 1973; so there wouldn't be green grass inside the stadium, regardless of what sports were being played there.
Future Charles Xavier: It is not their pain you are afraid of, it's yours, Charles. And as frightening as it may be, that pain will make you stronger, if you allow yourself to feel it, embrace it. It will make you more powerful than you ever imagined. It's the greatest gift we have, to bear their pain without breaking. And it's born from the most human power - hope. Please, Charles we need you to... Hope again.