When Oliver is first talking to his sister in Verdant, the news anchor in the background mentions that the particle accelerator at Star Labs would be completed by Christmas. This is a direct reference to the Flash, who gained his powers when the particle accelerator exploded.
Actress Summer Glau makes her debut appearance. This marks her second time working on a project based on DC Comics. She previously voiced the character Supergirl in the animated feature Superman/Batman: Apocalypse (2010).
Oliver decides to retire the pseudonym "The Vigilante." Vigilante was the title of a different DC comics hero who was a member of the cartoon adaptation of the Justice League along with Green Arrow. His character was voiced by actor Nathan Fillion, who was a co-star of Summer Glau (Isabel Rochev) on the TV show, Firefly (2002).
Summer Glau (Isabel Rochev) and Emily Bett Rickards (Felicity Smoak) share the same birthday ten years apart. (Glau was born July 24, 1981 while Rickards was born July 24, 1991)
This was the first episode to be translated in Arabic.