On disc two, highlight Navigation Options and press Enter. Then enter the numbers 52579 (the U.S. theatrical release date for Alien, May 25, '79) to get the DVD production credits.
On disc four, highlight Navigation Options and press Enter. Then enter the numbers 71886 (the U.S. theatrical release date for Aliens, July 18, '86) to get the DVD production credits.
On disc six, highlight Navigation Options and press Enter. Then enter the numbers 52292 (the U.S. theatrical release date for Alien 3, May 22, '92) to get the DVD production credits.
On disc eight, highlight Navigation Options and press Enter. Then enter the numbers 112697 (the U.S. theatrical release date for Alien Resurrection, Novenber 26, '97) to get the DVD production credits.