 In her autobiography “Tis Herself”, Maureen OHara (qv) says that  Errol Flynn (I) (qv) was always prepared, always knew his lines,  and was a pleasure to work with in the mornings. But he drank and by  4pm was in no shape to continue. She did all the romantic closeups  at the end of the day with a black flag marked "X" to represent  Flynn.