Nyssa's alias is addressed as Ms. Raatko; in the comics, her name was Nyssa Raatko rather than Nyssa al Ghul.
First appearance of Katrina Law as Nyssa al Ghul, making her the third actor along with Cynthia Addai-Robinson and Manu Bennett to appear on Arrow as well as on Spartacus (2010).
Oliver is seen working out by hitting a tire with a sledgehammer just as Batman does in Batman Vs Superman: Dawn of Justice. Batman & Green Arrow are teammates in the comics.