19. The Real-Life Actor Appearing In His Own Movie

In Iron Man 3, there’s a scene at Grauman’s Chinese Theater, which is the Hollywood Walk of Fame location, where celebrities place their handprints in cement. The movie’s villain kneels in front of the theater and on the ground right next to him, yes? It is Robert Downey Jr.’s handprints and stars. No one knows if the directors chose to do this or if it was R.D.J.’s idea, but it was definitely a clever joke you might have missed if you weren’t looking closely enough.