Character mistake: When trying to teach Banshee to fly, he is told to make his sound waves super sonic. Sound waves cannot be super sonic. Sound can only travel at the speed of sound, it always does. I guess they were trying to tell him to use a very high frequency, but the speed would still be the speed of sound.
X-Men: First Class (2011)
1 character mistake
Directed by: Matthew Vaughn
Starring: Kevin Bacon, James McAvoy, Jennifer Lawrence, Michael Fassbender, Nicholas Hoult, January Jones
Factual error: Erik arrives in Argentina at a place called Villa Gesell, shown to be a town in middle of mountains. Villa Gesell is a beach town on the Atlantic Ocean coast, with no mountains.
Professor Charles Xavier: Listen to me very carefully, my friend: Killing will not bring you peace.
Erik Lehnsherr: Peace was never an option.
More questions & answers from X-Men: First Class
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Chosen answer: He's not okay with it, but he knows that Erik's views appeal strongly to her. To all intents and purposes, she's already made her decision - to try to stop her would likely only lead to an argument, which is not how he'd want them to part. Plus there is the somewhat major side issue that Charles has just been shot, so it's not really the right time for a discussion on conflicting mutant philosophies.
Tailkinker ★