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How do you know that it isn't the BTS video that is flattening the lighting, rather the main feature that is adding contrast to it? The problem when you say that the lighting started out as flatter on set than the final product is what is your frame of reference?
Basically you are just seeing one level of exposure and applied display gamma versus another -- and the one in the final image seen in the theaters is the one intended by the cinematographer. The one used by the BTS crew is designed to show you what is happening on the set, so they opt for an exposure and then color-correction that is both brighter and flatter to show you everything going on -- there is no need or intent to create mood and atmosphere.
You always light for the intended display gamma, that's not lighting "flatter", that's lighting for the intended display gamma.Back to Lighting...