This episode marks the return of the list given to Oliver by his father in the first season.
In a flashback where Anatoli is teaching Oliver how to build a bomb, Ollie's bomb blows up, and Anatoli chuckles, stating that on his first attempt, he almost blew off his fingers. In the comics, Anatoli is known as The K.G.Beast, who has a mechanical hand, replacing one that was blown off during an early battle with another D.C. hero, Batman.
In a brief shot showing the bands playing at 'Star City Nights' a band listed is Remy Zero. Remy Zero was that band who recorded the theme song for 'Smallville' a former CW show that featured the Green Arrow.
Despite having Swedish descent, the actor who plays Kovar (Dolph Lundgren) also played a Russian boxer named Ivan Drago in which Rocky (Sylvester Stallone) barely defeats in Rocky IV (1985).