In my limited experience with Giant Bomb, I have noticed some strange descrepensies about game entries. For example, the remake of Resident Evil is listed on the original entry, but the Director's Cut, which is just the original but with a new difficulty mode, is a separate entry, as is the DS version which is the original but with touch controls.
This isn't the only example I can think of. The various remakes of the earlier Dragon Quest games are all part of their respective original's entries, even the box set of the first two. MGS 1 Integral is part of the original version's entry, but not MGS 2 Substance. Does anyone know what the rules are regarding individual entries?