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)
Trivia: Jennifer Lawrence suffered an allergic reaction to her Mystique makeup.
Trivia: Hugh Jackman agreed to a cameo with two conditions - that money would be donated to his child's school, and that he be allowed to swear.
Trivia: Director Matthew Vaughn was originally slated to direct "X-Men: The Last Stand," but dropped out of that film over worries about the rushed schedule. He finally returned to the series with this film.
Trivia: There was going to be a scene where Xavier and Emma Frost had a mental "battle" where they would fight inside their minds, but the idea was dropped. A similar concept was eventually used in "X-Men: Apocalypse," in which Xavier and Apocalypse battle inside of their minds.
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 ★