One thing I'm curious about is how they avoided lens flair from small bright lights - the iPhone's lenses in my experience produce multiple very pronounced lens flares when shooting bright lights (and older iPhones used to produce one large green flare as well, but I think that's been reduced in the 14 and 15 - I'm sure other phones do as well, I'm just only familiar with iPhones these days).

Very large light sources likely helped (as did the matte boxes), but maybe they carefully chose the camera angles as well to minimise this?