How to modify someone else's wrong picture in a movie's Photo Gallery?

I always look for all pictures in a Photo Gallery before I submit the snapshots I have taken to be interesting of any movie. Today, I went into the Photo Gallery of The Princess Bride, and some pictures are duplicated, and/or incorrect. However, I can't edit the Photo Gallery as any other part of the movie (plot, storyline, name, filmography information...)
What can I do?