The difference between the anime and the movie is from Dornkirk never making it to Gaea.
The generally more Asian-looking clothing and technology could be due to Gaean natives filling a niche Dornkirk took, plus the more modern arena used by the (presumably larger) high-school Hitomi goes to could be a result of some further European tech influence tracing its way back to Issac Newton's longer stay on Earth.Van and Folken were the last Draconians
Many viewers assume the Draconian race was hunted to almost extinction.