Actor Allusion: When Raiden calls his enemies "walking vending machines," Kevin makes a joke about blood and calls Raiden "Dracula." His English-language voice actor, Phil Lamarr, played Vamp in MGS2 and 4.
Mid Development Genre Shift: Originally the game was announced under the title of Metal Gear Solid: Rising as a stealth-action game with a focus on stealth hunting. The game instead shifted to a focus on hack and slash gameplay when the development was of the game was switched from Kojima Productions to Platinum Games. However, the emphasis on stealth hunting still remains with the alert system, AR vision mode, and ability to hide and do stealth take downs (akin to the Batman Arkham series).
Name's the Same: George has the same first name as Solidus Snake, which makes Raiden more than a tad uncomfortable.
Kojima personally wanted Gray Fox to be the main character as opposed to Raiden. However, the development team wanted to use Raiden. Kojima also admitted that if Fox has been used, then he would have been the director of the game instead. In the final version, Fox's exoskeleton and sword appear in the game as DLC.