Trivia
According a news item from TeamXbox.com, and as mentioned in a podcast interview with Epic's VP Mark Rein, this game is the reason the 360 has 512 MB of RAM instead of the planned 256 MB. This modification of the system's hardware cost Microsoft an alleged $ 1 billion.
To convince Microsoft that the change was worth it, the guys at Epic took a screenshot of the game as if it were running using 256 MB.
Apparently the Chief Financial Officer of Microsoft Game Studios called Mark Rein to tell him that they had cost Microsoft one billion dollars, to which Mark Rein replied "we did a favor for a billion gamers".
To see the whole news item, click here.