The plot seems to be an homage to the 1944 film Laura: Maddie falls for a dead man through recordings of his radio show. Also, the woman that Paul McCain is in love with is called Laura.
A still drunk Addison refers to Maddie as a wanton woman, a scarlet pimpernel. He is conflating two novels. 'The Scarlet Letter' is about a Puritan colonialist woman who commits adultery, becomes an unwed mother, and is punished. 'The Scarlet Pimpernel' is about an English fop who trains himself into a formidable adventurer and goes on secret missions to France to rescue aristocrats from the post revolution Reign of Terror.
In speaking of innovation, Addison says Mr. Kleenex looked at his sleeve and said I have a better idea. Disposable tissue paper for runny noses was well known in 17th century Japan. But Kleenex, the fluffy soft tissue paper, was first marketed in the US by Kimberly-Clark in 1924 purely as a means of removing make-up and cold cream. Customers were using them as disposable snot rags long before such use was noted by the manufacturers.
When David calls Maddie from the bar, her number appears to be 255-5555