Franchise Killer: Nearly. Fan disapproval of the Three Generation Arc got the series kicked off the Tokyo Broadcasting System and if it wasn't for Gundam Build Fighters winning some of the fans back, it would've stayed off.
InoYamanaka sides with the Vagan after being cashiered by the Earth Federation.
Zera Gins, the Final Boss of the series and Fezarl's clone, is voiced by Daisuke Namikawa. Another case of Gundam characters voiced by Namikawa being tagged with Hatedom?
I Knew It: Take a hard look at the brownish-black mobile suit at the end of Episode 8 and compare that to the UE. Coincidence? I don't think so.
Yurin's death. Longtime Gundam fans saw this coming a mile away, thanks to the similarities her character had with Lalah Sune.
No Export for You: Bandai Entertainment announced that a simulcast with English subtitles would be released in Australia and Southeast Asia... but not in the United States or Canada. Even worse that Bandai Entertainment is long dead, thus making it hard for the show to come to even come to North America. Though the subs are now available in everywhere.
There had been an English dub in the Cartoon Network Philippines broadcast, though.
And Okto. A channel in Singapore has broadcast the same.
With AGE being ill-recieved both in its home country and by fan sub watchers, there is a very real possibility it may never be officially released in the US. It's certainly true that no part of Bandai-Namco, on either side of the Pacific, has even mentioned the idea of a North American or European export push in public.
What Could Have Been: Originally, Level-5 was hired by Sunrise to created a Gundam Licensed Game. Hino, who wanted to work with the franchise, wrote a plot summary for what would eventually be approved as this anime. Unfortunately the game sold poorly due to being released at the same time as Project DIVA. Makes you wonder how things might be better if they simply worked on the game and released it a few months earlier.
Some of the original character designs. They seem to be more cartoonish until the final design made them a bit more mature.
Old!Flit looks even older than in his final design.
Woolf in Season 2 is also originally to have a goatee.
Early in the show's run, rumors claimed that a disgruntled ex-Level-5 employee had leaked the overall plot as a final act of revenge; according to the "leak", the UE were entirely automated enemies (like Mobile Dolls), created by the Federation itself during the third generation and sent back in time. Why? Because when a real enemy appeared, they were incapable of fighting it off, and thus sent the UE back in order to jump-start their own mobile suit development. The fact that Flit was able to discern a deliberate attack pattern was pointed to as proof of this claim. Of course, said rumor turned out to be 100% false, but it did get fans thinking.