Insert the first disc of the set and highlight the ‘Special’ menu option. Next, press up on your remote to highlight a smiley face. Press enter to view the DVD credits menu.

Another egg can be found on the second disc. From the main menu, go to the 'Advertising' menu and there press your remote control's down key three times. A smiley face will appear underneath the 'Promotional Gallery ' entry. Next, press enter to be taken to a section showcasing some of the official 'Fight Club' merchandise.
Easter Egg by Chris Gould