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.
X-Men: Days of Future Past (2014)
Ending / spoiler
Directed by: Bryan Singer
Starring: Hugh Jackman, James McAvoy, Jennifer Lawrence, Michael Fassbender, Elliot Page, Evan Peters, Bingbing Fan
Magneto impales Wolverine with metal rods and throws him into the Potomac. Mystique shoots Magneto in the throat and points the gun at Trask, but Xavier persuades her not to kill him. Mystique and Magneto escape. Because Mystique didn't kill Trask, the Sentinel program is shut down and Wolverine wakes up in a peaceful future where Jean, Scott and others are still alive and living happily at the X-Mansion. Back in the past, Wolverine is fished out of the water by police and they hand him over to William Stryker, who turns out to be Mystique….
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More mistakes in X-Men: Days of Future Past
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.
Trivia: When Quicksilver is breaking Magneto out of prison he states that his mom used to know a guy that could control metal, implying that Magneto is Quicksilver's father, just like in the comics.
Question: Were the headphones that Evan Peters wore in the Pentagon escape scene available in 1973?
Answer: If you're referring to the behind-the-head headphones, NO! They were introduced in 1997: http://coolmaterial.com/roundup/history-of-headphones/.