Follow the White Rabbit
On the second disc, go to [Super Burley Brawl] where you will get a selection of 3 boxes to pick and watch the same scene in different ways. After making your selection, near the begining when the movie starts, in the large box press the [Right] button on your remote and you will highlight a white rabbit. Press [Enter] and you will see a 5 minute featurette on how they made all the extras of Agent Smith.