Cheat: On the subsistence disk, start a new game stating 'I like MGS3' and then save it as soon as you can after retrieving the back pack. Now when you put in disk two - Persistence, you can now watch some rather amusing video clips.
Factual error: At the beginning of the game, Major Zero mentions that the HALO jump that Naked Snake is about to undergo is "the worlds first HALO jump". The first HALO jump actually happened in August 1960, four years before the game is set.