the dvd and blu-ray releases have audio-voiceovers on the special features. this means people who cannot see very well are still able to watch the film. this is not in the steelbook release though, as this release lacks any menus and plays the film automatically upon insertion. the steelbook's front cover also displays sam worthington in a different costume than he wore in the film.the back of the steelbook has errors on it that don't add up with the story. this means that the story might have been changed when the film was released in different countries.