Continuity mistake: When Mystique is on the exercise table and Erik lifts the bar off her, her right leg changes from stretched out to bent from the different camera shots.

X-Men: First Class (2011)
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Directed by: Matthew Vaughn
Starring: James McAvoy, January Jones, Jennifer Lawrence, Kevin Bacon, Michael Fassbender, Nicholas Hoult
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Professor Charles Xavier: Listen to me very carefully, my friend: Killing will not bring you peace.
Erik Lehnsherr: Peace was never an option.
Trivia: In the bar, when Wolverine dismisses Xavier's offer to join him, Hugh Jackman ad-libbed the line "go f*** yourself." The line was originally written "F*** off." Later, in "Days of Future Past", Xavier remembers the line as "F*** off", not "go f*** yourself." (00:48:15)
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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