Marvel's Luke Cage: 44 Easter Eggs You Probably Missed
42. "Mr Bulletproof/Power Man"
When Pop is talking to Luke in the barbershop in the first episode and talking about how his powers could be used to help people (to Luke's apparent frustration), Pop calls him Mr Bulletproof.
Obviously that's an early reference to his impervious skin, but it's a good launching point for the show's massive point of cultural relevance at the moment. You won't have missed the mentions of the world needing a Bulletproof Black Hero in light of events in America.
More importantly for comic book fans, Pop also calls him Power Man, Cage's official superhero alias in the comics.