Anyone have any tips on how to use the Light Spill feature effectvely and how to make it match the background lighting just as in the demo video? It only has two sliders that I can see and I can't see the effect when I adjust them.
Try looking through the Project Overview view. (Watch this video tutorial to learn how to switch views and also help you get a better key.) The other possibility is that your canvas is at a low quality, so you cannot discern subtle differences within the video. What is your canvas quality?