When Rory (Dominic Purcell) says "Prison break" and makes a funny face before saying "I'm in", this is an obvious nod to the show Prison Break (2005) which Dominic starred in along with Wentworth Miller who, in turns, plays Captain Cold in Legends of Tomorrow and The Flash (2014).
Steel uses the line "Come with us if you want to live" paraphrasing the famous Michael Bein line from Terminator.
The amulet Zari has is identical to the one worn by Isis in the 1975 TV show The Secrets of Isis.
Ray references having previously fought Kuasa with her Water Totem in the second season of Vixen, though isn't aware that the enemy they are fighting is in fact the same individual.
In DC Comics, Zari Tomaz is named Adrianna Tomaz who is known as the superhero Isis. She is able to use a mystical amulet identical to her totem on the show to harness the Powers of Isis using the incantation "I Am Isis", granting her power over the elements. She also has a little brother who becomes the superhero Osiris. Her amulet and her brother's powers were given to them by Black Adam, who Isis was in a relationship with. The two eventually married and ruled Kahndaq. The character originated from a Captain Marvel TV show before being introduced into the comics.