When it's revealed that Jessica Jones is spying on Luke Cage he's seen wearing a mustard/gold tight T-shirt, which is precisely what he wears in the comics. It's a nice simple nod. Not only is he wearing an Easter Egg, there's also a delightful little gag when Cage and Jones hook up. When asking her why she's detached, he insistently asks her whether "it's a race thing". It's played as a joke, but it actually references Cage's origin in the comics. He was inspired by popular blaxploitation films - hence the name Power Man - and it feels like that gag is a loaded nod to those early days of the character in the '70s.
