Dawson Casting: Both averted and inverted. All actors were about the same age as their characters and Leonard Yung was 15 while playing 10 years old Sun.
Real Life Writes the Plot: If you pay attention to who is traveling where over the course of the series, you will realize that only Australian actors were flown to other countries, and more importantly that the plot is written so as to reduce the need to fly actors back and forth.
Throw It In: The weather during shooting in China was poor, with foggy sky and almost constant raining. The producers decided to use it as form of Empathic Environment - when Sharak takes over the Land of the Dragon Lord, everything is gloomy and dulled.