In Japanese, multiple Mobile Suit Gundam 00 voice actors are used: Avan is voiced by Allelujah/Hallelujah Haptism, Zeri by Tieria Erde, Juliana by Anew Returner and Aliasse by Mileina Vashti. Too bad Setsuna and Lockon are missing in action.
Lanseal's Music Room was originally going to serve as the Sound Mode, where players could listen to the game's soundtrack.
Zeri's room was originally going to have piles of newspapers in it, to show that he spends a lot of time gathering information.
Julianna was suppose to be a male, only for the production team to change their minds and decided to revamp the character as a female instead due to concerns that too many male characters will be shown.
Throw It In: During the game's production, a female staff member said that she wanted to see a character who's a butler in the game. Since no one objected, the producer agreed to her suggestion. At the same time, another staff member asked to put in a holy maiden type character. The producer agreed, but made Inghild not tied to Eastern religion or Yggdism.