When Maseo says Oliver's disguise "wouldn't work even if you smeared grease paint all over your face," this is a reference to the Arrow's use of grease paint to hide his identity prior to his use of a mask.
Laurel is referred to as the Black Canary by her father.
In the opening, the arrowhead symbol is the one from season 2. This is a foreshadowing of the episode's content.
John says the name of his brother was Andy. Andy Diggle is one of the writers of the Arrow Year One comic on which the TV show is based. John Diggle is also named after him.