One of the deleted scenes from X-Men: The Last Stand was a scene in which Pyro tells Magneto that Worthington Labs has announced a “cure” for mutants. But instead of a single deleted scene, they actually had two versions of it. In the first version, Magneto was his usual dapper self. In the second version, to show that he’d been in hiding for a while, Magneto has a heavy beard.
I can understand why they dropped the scene. It was 30 seconds of film that really didn’t do anything to advance the plot. Having Magneto show up at the mutant community meeting was a much more dramatically effective way of showing that he knew what was going on.
Of course, another good reason for dropping it is that in the version with the beard, it looks as though the brotherhood of evil mutants is being led by Gandalf.