This is the first time Claire Temple is called the Night Nurse. There were several characters that filled the role of Night Nurse in the comics. Claire is an amalgamation and has characteristics of the various characters.
The episode's title is the name of Gang Starr's song from the album Hard to Earn.
Luke Cage briefly mentions to Misty Knight that he was in Force Recon. Force Recon is the short name for Marine Force Reconnaissance, the special forces unit of the U.S. Marine Corps. This makes Cage a former Marine. In the comic books, Cage is never given any military affiliation, experience, or record. He was also never a cop in the comic-book universe as he is portrayed in the Netflix series. It could be a nod to one of his earlier roles - that of Spartan Locke in Halo: Nightfall (2014).
Mike Colter (Luke Cage) and Roger Brenner (FDNY / EMT) also worked together on four episodes of The Good Wife (2009) as Lemond Bishop and various characters respectively.