On the [Main Menu] highlight the [Play] option and press the [Up] arrow key on your remote control. This should highlight one of three clips available on that side of the screen, all of which can be activated by pressing the [Enter] key.
Now, highlight the [Subtitles] option on the [Main Menu] and then press the [Up] button once more. This will give you access to two more hidden clips.

Finally, go to the [Special Features] sub menu. Highlight the [Commentary] option and then press the [Right] arrow key on your remote control. This will allow you to view even more clips.