Marc Guggenheim previously worked on Law & Order where he served as an executive story editor, co-producer and producer in addition to writing eight episodes. Plus Kirk Acevedo and Catherine Dent both played different roles in several Law & Order shows.
Chance quips that he'd always wanted to say "I am Spartacus", referencing the 1960 film Spartacus. In the film, the title character gives himself up in order to protect his friends. However, he is followed by the rest of the slaves all proclaiming they are Spartacus as a show of loyalty.
As of this episode, the public knows about 3 things that were considered secrets in previous seasons.
They know that the Arrow and Green Arrow are the same person.
They know that Oliver didn't spend the whole 5 years when he was away on Lian Yu. They know that he was also in Hong Kong and Russia during that time.
They know that Roy Harper wasn't the Arrow, and that he just faked his death and took the blame for the real Arrow.