Concept art (Special Edition version)
Select the "Art Gallery" option at the "Special Features" menu. Highlight the "Main Menu" option at the next screen, then press [Up] to highlight Wolverine's dog tags. Press [Enter] to view concept art for The Beast and The Blob, which were characters that were cut from the production.
Spider-Man (Special Edition version)
Select the "Trailers And TV Spots" option at the "Special Features" menu. Press [Left] to highlight the rose in the top left corner of the screen and press [Enter] to display a hidden screen featuring Spider-Man. For the European version, select the "DVD Special Features" option at the main menu. Select "TV And Trailers". Press [Left] to highlight the knight, then press [Enter].