
Continuity mistake: When Magneto lands the Golden Gate Bridge on the island, as it hits land it is still very light. When the Brotherhood start to walk toward the island, it cuts to a wide shot of them still walking on the bridge, and it's suddenly dark.
Chosen answer: The piece did move, very very slightly. I'd argue that the cure is generally permanent, but perhaps with someone of Magneto's power the X gene can't be permanently suppressed, and will slowly regenerate itself through his body, gradually restoring him to full strength.
Jon Sandys ★