 SPOILER: The final scene of Magneto, in which he is able to use his  powers to move the chess piece, as well as the coda after the  credits where Professor X speaks to Moira MacTaggert, were not in  the script, but secretly added during filming. Both  Ian McKellen (qv) and Patrick Stewart (I) (qv) admitted that  even they, the actors, didnt know if the scenes would appear in the  final edit until they saw the finished film.