Continuity mistake: When Cyclops tries to shoot an optic blast at Shadow King's astral form, his right hand is bare. When Shadow King attempts to possess Cyclops, he is suddenly wearing a glove on his right hand. Both of his hands are then bare when he is helping Storm to her feet. (00:19:38)
Continuity mistake: When Wolverine knocks out the security guard, he collapses in front of the parking arm. When Gambit and Wolverine are shown looking up at the water tower, the parking arm is just behind them, and the guard is no longer there. (00:14:17 - 00:14:47)
Continuity mistake: When Gambit is fighting the guards, he knocks out three of them. When Wolverine begins walking away, there are now four guards unconscious on the floor. (00:15:26)
Continuity mistake: When Wolverine is taking cover from the Sentinel Prowler, there is a blast mark in the pillar by his head. After Gambit asks Wolverine to give him back the collar, the blast mark has disappeared. (00:20:55)
Continuity mistake: When Wolverine returns home at the end, the counter where Forge is standing is across from the end of the table where Shadowcat and Iceman are sitting. In the final shot before the credits roll, Forge and the counter are now behind Shadowcat. (00:21:58)