Talia asks Thea about her sister Nyssa to which Thea says "She's on vacation working on her tan." It's a fitting joke since Katrina Law, the actress who plays Nyssa is now on Hawaii Five-0 (2010).
While not having as many as the previous episodes, this episode has some callbacks and references to previous seasons. When John and Lyla talk about their last dance, they reference to the events of Suicide Squad (2014): Gholem Qadir's son Farzad Qadir appears in this episode and his main motivation of to get revenge for his father's murder. Oliver's and Thea's talk by the bonfire is very shot very similarly to the one they had on Lian Yu in The Return (2015). Oliver mentions to Talia that his students used to ask questions first, as seen in Checkmate (2017). Oliver also mentions the debt Talia owes him and the death of Jarrett Parker, both of which happened in The Demon (2018).
The tomb of Al Fatih is in the same mountain that Oliver dueled Ra's Al-Ghul atop in The Climb (2014).