Rebecca Romijn's (Mystique's) and James Marsden's (Cyclops') roles were reduced substantially when this movie was rushed into production, and the two cast members had prior scheduling conflicts.

(at around 1h 15 mins) Time of day during the final battle sequence. The first pan over the bridge from southeast looking north, is clearly midday as the shadow of the bridge is almost directly underneath it. When Magneto first walks onto the Golden Gate bridge it is close to sunset, and the shadowing is very inconsistent, sometimes sharp from direct sunlight, sometimes not. By the time they move the bridge and drops it onto the island, and lowers himself to the bridge, and all the mutants move forward, it is suddenly dark. In the DVD commentary, everyone acknowledges it, but says "Hopefully you're into the movie enough..." The whole battle is then shown as taking place in the dark.

SPOILER: A scene appears after the closing credits: Dr MacTaggart checks up on her comatose patient, and discovers Professor Xavier transferred his mind into the patient's body.

The original DVD release of the film had two different sets of navigation menus, one themed around the Brotherhood, and one themed around the X-Men. The content selectable is the same regardless, but this aesthetic was not reused on the Blu-ray release.

Edited into The Charlotte Church Show: Episode #1.6 (2006)