The price for the Mesal Gear Solid minigame is exactly 573. Konami is represented by the goroawase number "573". "Five" in Japanese is go, changed to the voiceless form ko; "7" in Japanese is nana shortened to na; "3" in Japanese is mittsu, shortened to mi; "573" = ko-na-mi.
In the Japanese version, Akio Ohtsuka and Takeshi Aono, who voiced Snake and Colonel Campbell respectively in the Metal Gear Solid games, reprised their character roles for their cameos in this game. However, in the US version, David Hayter and Paul Eiding, who voiced Snake and Colonel Campbell respectively, were not able to reprise their character roles for this game. Instead, Peter Lurie and Michael McColl played each character, respectively.