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