The show Supernatural (2005) is mentioned in this episode. The character Atropos also was featured in My Heart Will Go On (2011) Season 6, episode 17
Lita's Halloween costume is very similar to Leonard Snart's costume during his time as a career criminal.
Zari briefly hallucinates a cat, that appears to be the same one she was turned into when Charlie and Constantine broke history last season.
Nate and Behrad refer to Zari and the latter as the 'Wonder Twins', a superhero duo originating in The All-New Super Friends Hour.
Charlie warned the Legends that seeing a Fate's true form is too much for a human to handle and would be deadly. It happens in this episode when Atropos uses it to kill one of Charlie's former bandmates, Declan.