What's fascinating to me is that they chose blue screen over green screen. Both of these are used [green is preferred these days] because they are colors exactly opposite to the red influences in Caucasian skin tones. I'm theorizing the blue rendered better skin tones for this particular film, given the majority of skin tones involved. Why is that notable? It's EXPENSIVE. Blue screen requires twice the light (usually) that green screen does. The director cared deeply about the look.
Further. Caucasian skin tones were 'backseated'. That's an historical triumph in itself, if I'm correct. So many times black skin ends up with odd color casts and undertones in film.
Nice to see it prioritized.