Erik Lehnsherr: Tomorrow, mankind will know that mutants exist. They will fear us, and that fear will turn to hatred.
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X-Men: First Class (2011) - 35 mistakes
This has been explicitly stated by the director as not being a reboot of the franchise (in this interview, and verified by a consistent cameo appearance I won't ruin for anyone who hasn't seen it yet). It's simply a prequel to the other X-men movies, and as such differences in continuity between this movie and those are valid mistakes. Please don't get too worked up over it - this is meant to just be a bit of fun, after all...
Factual error: During the bar scene in Argentina, Magneto uses a dagger he took from one of the former SS Soldiers. It appears to be a Reichsarbeitsdienst dagger with the inscription "Blut und Ehre." This is incorrect as the inscription should read "Arbeit Adelt." "Blut und Ehre" was inscribed on Hitler youth knives as that was their motto.