As someone who still owns every piece of glow-in-the-dark plastic from when I was a kid, I loved the phosphorescent night life. However... I think that the only time you would have “night” on a moon orbiting a gas giant would be when the planet is between Pandora and its star. Think about how bright our own moon is at night: when it’s full, you can read by it. And it only fills half a degree of the sky. From the look of it, Pandora’s gas giant covers about 60 degrees. Imagine that much starlight being reflected from a high-albedo cloud world -- it would be as bright as day.
In the film, it’s stated that Pandora has lower gravity than Earth, and that would explain how the banshees can fly by flapping instead of soaring, but then one should be consistent: everything that falls would have to fall at a much slower rate of acceleration, yet it seems that everyone and everything falls at an earthly rate on Pandora (to be fair, it would be a much slower-paced film if they did that...). I did like the zero-G in the opening scene, though.
One thing I expected to see but didn’t: after all the talk about how all the life on Pandora was electrically connected in a gigantic neural net, I was expecting the white male neo-liberal to be the one to figure out how to harness that power into a directed-energy weapon, with plasma bolts shooting from the Tree of Souls.