Casting features prominent diverse actors like Denée Benton as Peggy, with themes sharpening attention to race, gender inequality, and social divisions alongside class rivalries. LGBTQ+ representation is significant, including the closeted gay character Oscar van Rhijn in a long-term secret relationship and a shocking gay twist in a recent episode, adding layers of identity exploration in a historical setting.

These elements influence character arcs and subplots substantially but do not form the foundational premise, which remains centered on old money versus new money conflicts in 1880s New York. Creator Julian Fellowes highlights hidden Black history without overt activist statements, and while some prior seasons drew minor criticism for unrealistic racial integration, Season 3 garners high praise and viewership peaks with no widespread audience backlash labeling it 'woke.' The progressive messaging is competently woven into the period drama but elevates identity politics beyond incidental diversity.