This is the final episode where Earth-2 Laurel uses the moniker Black Siren and the first where she finally uses her Earth-1 counterpart's moniker, Black Canary.
This episode includes some references to Season 2. Sara said that Felicity came a long way from "the I.T. girl who was secretly crushing on Oliver Queen," referring to her description in that season. Felicity mentions the times Sara said she's "cute," which were in the episodes League of Assassins (2013) and Time of Death (2014).
This is the first time since Necromancing the Stone (2018) where Sara is seen wearing the White Canary suit.
It is revealed by Laurel that earth-2 Sarah has been pregnant in the past.
Felicity confirmed she have been flirting with Sarah in the past (referring to season two)