Excellent work. I like that this tells a story rather than just being a big fly-through of a piece of terrain.
There are a couple sources of "flicker"/noise in the animation that can probably be addressed by using different settings. First, using Raytraced Objects is almost always recommended. The objects themselves will look better and render time will tend to be faster. If there is a lot of motion blur however the render time can be longer for equivalent quality. Quality for raytraced objects is largely determined by the antialiasing level rather than detail level. This is true for other Raytraced parameters like Raytraced Atmosphere as well.
Speaking of Raytraced Atmosphere, that's another setting you should use if you are not already doing so (if you don't have TG 2.2 that includes this feature, just do an update). If you use this you should get less noise in the clouds and atmosphere and faster render time as well.
Finally there are possible Global Illumination flicker issues in some parts. If you're using GI, upping Sample Quality can help. Also turn on Supersample Prepass. See if either of those things help.
Hopefully the next version will get rid of those problems. Keep up the good work!
- Oshyan