-When Snake hides from the two Irvings near the box of watermelons, the box reads "No Place For Hideo".

-You can see a ghost image of Hideo Kojima in Otacon's lab using the camera, between Policenauts and the poster that from a distance reads "Final Fantasy VI".

-On the computer, the term "Video 2" is called "Hideo 2".

-After defeating Screaming Mantis and right after Psycho Mantis vibrates your controller, keep pressing X to see Hideo Kojima.

-Prolong the Psycho Mantis fight long enough and the game will show the opening screen, except the word "Kojima" will replace "Konami". The Psycho Mantis fight will then resume.

-Press L1 to examine the .50 cal anti-material sniper rifle, which says "Recommended by Hideo Kojima".