Because the bathing suit that Marilyn wears in the film was so risqué (for the time) and caused such a commotion on the set, director Joseph M. Newman had to make it a closed set while she was filming.
Charley refers to Eadie as 'Cynara, Lilith , Cleopatra and Helen of Troy'. 'Cynara' is the title of a poem by Ernest Dowson (1867-1900) (as well as the title of movie, Cynara (1932)). Lilith is also the name of a goddess/ demon of the night (from Mesopotamian mythology).
Charley's quote from John Webster is from "Westward Ho", Act II Scene 2. It is also quite similar to one of the Apothegms of Francis Bacon (1561-1626) - "Alonso of Aragon was wont to say in commendation of age, that age appears to be best in four things, - old wood best to burn, old wine to drink, old friends to trust, and old authors to read".
Marilyn Monroe doesn't appear in the film until the 31st minute.