 A line in the films 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.