Select the "Special Features" option at the main menu, then select "Visual Effects". Select either the "How a Patriot Loses his Head" or "Recreating a Digital Army" option. When you enter either of those two options and play it, you will notice that there are three different sections on the screen playing footage. Press Left, Right, Up, or Down to see small yellow arrows appearing in all different sections that are playing footage. You will have to toggle a bit to find them all. Each arrow will tell you something different when you selected.
All easter eggs were generously submitted by SirDonk