The Narrator is GodHe seems to exist within the series and interact with it, but is also aware of the shows fictional nature and knows what's going to happen in advance.
The Devil Gundam didn't malfunction. Its AI is sentient & made a conscious choice to destroy humanity.Seeing what mankind had done to the Earth, combined with Urube's attempt to use his powers for evil convinced him that humanity was rotten & it would be better to wipe them out & replace them with cute little Samurai-themed SD Gundams.
Allenby is the next King of Hearts.Allenby has two very good incentives to ask Domon, the current King of Hearts, for training. Domon has already learned the secret to suppressing his anger in battle, which would allow Allenby to resist the Berserker system if it's ever forced on her again. Training would also give her an honest reason to be near Domon, since she's obviously still infatuated with him even if she refuses to act on it. Domon would likely agree to train her, as she's already demonstrated the ability to use the Shuffle's unique ki for both offense (the God Finger attack) and defense (her quick and complete recovery from DG Cell infection). As Domon's first and/or only pupil, Allenby would naturally be next in line for the title of King of Hearts.
Everything was part of a plot to destroy The Statue of Liberty CannonDG cells, Master Asia, Devil Gundam, Kyoji Kasshu, Ulube Ishikawa, Wong Yunfat, and even the Death Army were pawns in an elaborate (and successful) scheme by Neo Japan to destroy Neo America’s most powerful weapon - The Statue of Liberty Cannon.
Master Gundam can be piloted backwardsIn one episode Master Asia crossed his arms and Master Gundam's arms were doing the mirror opposite.
Simon from Gurren Lagann is Domon's son!Or, at the very least, his clone: Don't believe me? Check this out: http://www.youtube.com/watch?v=zskL7AAVnRg
Domon is descended from Noriko Takaya.Just listen to those insanely Hot-Blooded Attack Calls!!
The Devil Gundam is a reaper or based on reaper techThink about it, it desires the extinction of humanity, has the ability to revive dead organics as zombies (AKA husks!!) and appears to be able to warp the views of others towards its own (AKA indoctrination!!)