I'm not aware of the differences in the Xbox version compared to the PC. But I've heard a few complaints about some items and enemies being in different places or not there at all on harder difficulties.
Yeah i actually visited the martian buddy website in the spam email, 0503, well thanks for the explanation, i beat veteran and couldn't find either martian buddy cabinet, i'm playing on nightmare now so i definitly doubt its there.
there are differences between the xbox version and pc. the pc version has the martian buddy cabinet and i think it has ammo or something. also pc version has the "ghost mother" thing where she asks for her baby to be given back. but the spam email is still in the xbox version.