Dinah asks Oliver if anyone has ever told him that he has lousy taste in women. Oliver replies in the affirmative. This is a tongue in cheek reference to the fact Green Arrow and Black Canary are romantically linked in the comics.
Lex and Green Arrow fight in hand to hand combat in this episode. The fighting style used is based off Kurt Wimmer's film Equilibrium where the martial art of the future is called Gun Kata.
Clark mentions to Dinah that Oliver's team could use a "den mother". In comics, Black Canary is one of the den mothers along with Red Tornado in Young Justice.
Clark: (referring to Lois) "Maybe she'll get used to the whole dual identity thing someday." Oliver: "Yeah, like when? When the Earth cracks open and time ticks backwards? I don't think so." This is reference to superman (1978) movie.
This represents the first appearance of Lex Luthor's office at the Daily Planet. When Black Canary uses her sonic scream against Clark, they're in front of a Daily Planet office labeled "Lex Luthor, CEO".