The story incorporates prominent racial identity elements: George is explicitly mixed-race (white mother, deported Grenadian Black father), faces taunts about his hair texture on the evacuation train, and experiences prejudice that underscores his determination to return. Director Steve McQueen has stated the film corrects 'whitewashing' of history by depicting multicultural London communities, shelters with diverse characters like the Nigerian warden Ife, and themes of racism persisting amid wartime solidarity; he links it directly to contemporary race issues.

These elements influence character arcs and subplots significantly but do not form the foundational premise, which remains the mother-son bond and survival adventure in a traditional war drama structure. No established characters were altered for diversity; all roles are original.

Reception includes praise for historical nuance alongside criticism of didactic racial messaging and presentism in portraying 1940s demographics. Casting evidence: Casting research is incomplete or contains unresolved comparisons; overall casting fidelity has not been established. Documented credits include Elliott Heffernan as George Hanway; Saoirse Ronan as Rita.