The title of this episode is a quotation from "Hamlet". It is spoken by the Ghost: "I am thy father's spirit/Doomed for a certain time to walk the night/And for the day confin'd to fast in fires/Till the foul crimes done in my days of nature/Are burnt and purg'd away".
US attorney Linc Potter asks Sheriff Roosevelt where the city clerk's office is so he can look into "Mayor Quimby's" development plan. He clearly meant Mayor Hale but Potter made a reference to the corrupt and morally challenged Mayor Quimby from The Simpsons (1989), making light of Hale's questionable position as both mayor and chief real estate developer in Charming.
Santo Rivera who is a member of Romeos crew is played by Senen Reyes. Senen Reyes better known as Sen Dog from the hip-hop group Cypress Hill.