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In case anyone else is wondering about the final video clip but does not want to repeat often enough to figure out how to unlock it (ok, I found unlockables hints if you want to unlock it, it not something I would ever guess; note: hints for all unlockables and achievements (not sure if those are supported with galaxy?) on that page). Without unlocking, you can start viewing from the second to last video clip (in the scene index from the lock main menu page) and continue and after the normal end you will see the final video (as of installer version game version 1.1). Not that you are missing all that much if you don't see it.