Hey, It's That Guy!: Kelly Brook, Carmen Electra and Louise Rednapp appear in the pin-ups in the initial release of the game. When it was re-released, Konami didn't re-license the images from FHM.
To a lesser extent, most of the game's music was composed by Harry Gregson-Williams (He composed music for Armageddon and The Rock.) Kojima was inspired to have him compose the soundtrack after he and sound director Kazuki Muraoka saw The Replacement Killers in a cinema (Gregson-Williams had composed the music for that film as well) and found they enjoyed his compositions.