This is the last game for which the Japanese voice actor Kôji Totani provided the voice of Leon prior to his death on 6 February 2006.
When working on the game, the development team asked Halo developer Bungie for any high resolution data they had to assist them in being as detailed as possible with their SPARTAN and the SPARTAN's fighting arena. Some of the Halo 2 textures they had were sent over and worked just fine in the SPARTAN's arena, but unfortunately their image of the earth could not hold up at that high a resolution. Bungie had nothing nowhere near as high resolution image of the earth from Halo 2, but they did have an extremely high resolution image of the earth from one of Halo 2's commercials. After some digging, the image was found and sent sent over and that is in the final version of the level.