Florian pines for a girl named Rosaline, just like Romeo does at the start of the play 'Romeo and Juliet'.
Florian mentions 'all the perfumes in Arabia', a quote from Macbeth, Act 5 Scene 1, as spoken by Lady Macbeth.
The song performed by Condell while posing as "Mistress Sauce Quickly" is a variation on the song performed by the Fool in 'Twelfth Night', Act 5 Scene 1.
The monologue Kate performs before blowing out her candle is from 'Romeo and Juliet', Act 2 Scene 2.
Each episode utilizes a plot device from one of Shakespeare'a plays. In this case, Will goes to an apothecary to buy a potion that will make Kate seem dead, as in 'Romeo and Juliet,' the very play Will is working on throughout the series.