Continuity mistake: When Wolverine and Rogue are in Wolverines truck, just prior to the crash, we see them driving near huge trees with thick leaves that can't be seen through. When Rogue says the line "You really should wear your seatbelt", the view out her window shows a handful of trees that one can see through for a mile.Gavin Jackson
Continuity mistake: When Senator Kelly meets Magneto for the first time, it's outside and cold. When you see Kelly his breath shows blowing to the left of the screen. But when you get the reverse angle of Magneto and Mystique their breath also goes off to the left of the screen. It should be blowing to the right.
Continuity mistake: In the Statue of Liberty, when Toad has shot his slime at Jean Grey's face, we see Cyclops shoot his optic beam to free himself from the room he was trapped in. Then he rushes to Jean's aid. If you look closely you can see that the gloves he was wearing, as part of his costume, are no longer there when he takes the slime off of Jean's face. (01:15:37)
Continuity mistake: In the medical bay at the end, Jean's medical coat keeps jumping from positions on her shirt between shots.