X-Men 2 (2003)

Visible crew/equipment: When Nightcrawler and Storm teleport into Cerebro 2, a crew member with a white hat is visible beneath the bridge to the bottom right.

Audio problem: When the last police car arrives at Bobby (Iceman) parents house, it skids up to a halt on the grass out the front of the house. The sound effect used is a car skidding on concrete, not grass.

Continuity mistake: When Nightcrawler tries to stab the president he is in the middle of the table but in the next shot he is at the edge.

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Continuity mistake: When Nightcrawler rescues Rogue from falling in mid-air, he dives back into the jet. In the next shot, you can see that the hole in the jet is folding and repairing itself, but a couple of shots later, the hole repairs itself again.