Due to
Spencer Tracy's health, the cast was always working from two shooting scripts, one with Tracy, one without. Typically,
Katharine Hepburn brought Tracy in the morning, they worked until she decided he was too tired, then Tracy and Hepburn left.
Sidney Poitier, who already had received a Best Actor Oscar for
Lilies of the Field (1963), was intimidated by working with two legends, and preferred to perform to empty high backed chairs.
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