Access the [Special Features] section of the DVD. Wait for the [Memento Mori] picture to move and the pic of Leonard with a pic in his mouth to take up most of the screen. Press [Enter]. A screen will come up telling you you have found the hidden version of the film. Click on [Play]. Watch the film in chronological order including the end credits rolling backwards at the beginning and the opening segment running forwards. This applies only to the region 2 version.