My favorite plot moment so far is in little blurbs when you run combat animations. Fuu said something in the ballpark of "I will end nightmares that plagued my childhood with my own two hands"
And then you remember, that in the universe, ten years ago, in Previous Big War, there was previous Dr. Hell Uprising and that wasn't nice for anyone in Japan. And Fuu is 14 years old schoolgirl and mech pilot. Yeah...

Generally, the nods to Previous Big War are very interesting. We know that there was One Year War, Dr. Hell, Dinosaurs, Voltres Aliens, GaoGaiGar and something else mashed together, possibly Zeta too, and Amuro, Getter Team, Mazingers, Voltes, Braves and some other people who I don't remember right now were on Argama, flying around and smashing problems right in the face, and half of the younger cast of your current team was there, grew on their exploits and was inspired.