Continuity mistake: When Angel is saying goodbye to Wolverine, the driver's side door of his car is open, and he is standing on the interior side of it. When the shot changes, you can see the door is now closed (note the window glare). (00:03:41)
Continuity mistake: When Emma Frost is lamenting her students being taken away from her, she is standing inches away from the window. A couple of shots later, and she has instantly moved several feet away from the window. (00:04:44)
Continuity mistake: When the X-Men are following Magneto to see Xavier, Cyclops is on the far left and Iceman is standing next to him. Once Magneto has opened a doorway to the room Xavier is in, Cyclops and Iceman have swapped places. (00:17:10)
Continuity mistake: When Magneto uses his powers to create a hole in the metal wall, the edges of the wall surrounding the hole are smooth. When the shot changes, the edges suddenly look crumpled. (00:17:16)
Continuity mistake: When Shadowcat tells Iceman that Emma Frost knows what he is thinking, the shocked expression on his face is drastically more pronounced when the shot changes. (00:05:37)
Continuity mistake: When Magneto is telling Wolverine that Xavier wouldn't approve of his commando raid, his neck area is flesh colored, when it was previously shown to be purple because of his costume. (00:16:45)