This Easter Egg applies to the Region 2 of U2 - best of 1990-2000
Select "Last Night On Earth" from the bonus videos section. When the screen appears to play song with or without commentary, highlight director`s name (Smyth) and press up,up,left,left and one of the boxes on the left hand side will be outlined. Press enter to view an outtake from this video.
Also, if you select the video for "One" and, when the screen appears to play song with or without commentary, press 1 enter 1 enter 1 enter.You will now be rewarded with a screensaver of sorts.