A line in the film's ending, 'Cover her face, Mine eyes dazzle, Gwennie', spoken by Dr. Kennedy to Gwennie, are references to almost identical lines in Scene 2, Act 4 of the 17th century Jacobean play 'The Duchess of Malfi' published by the English playwright John Webster in 1623. In the 'Duchess of Malfi' the referenced line is 'Cover her face. Mine eyes dazzle. She died young.', spoken by the character Ferdinand to Bosola.
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