In the movie The Man With The Iron Mask (1998) in the scene where the three musketeers want to free Philippe (Leonorado De Caprio), Philippe has one iron mask on (mask 1). They then make another mask (mask 2) and they put it on some corpse which they use in the escape. This body is then quickly burned. After they leave, they send that same mask (mask 1) to Louis (also played by De Caprio). In a subsequent scene, you see Philippe looking at his mask (mask 3? mask 1???)
I realize they could have made 100 masks and sent them to all corners of paris, but was this intentional or is it a plot hole?