Phil Klemmer revealed that the singing scene was recorded live on set, and Dominic Purcell (Rory) sang his line without rehearsal.
Of the four Arrowverse season finales in which LaMonica Garrett appears as Mar Novu/The Monitor, this is the only one in which he has no dialogue.
In the DC comics, Adrianna Tomaz (Zari Tomaz's comic book equivalent) has a brother, Amon Tomaz, who goes by Osiris. He has a portion of Black Adam's powers every time he speaks his name, having been granted them by Black Adam himself.
Young Zari renames Wickstable, "Mithra," which is the Zoroastrian angelic Divinity (yazata) of Covenant, Light, and Oath. In addition to being the divinity of contracts, Mithra is also a judicial figure, an all-seeing protector of Truth, and the guardian of cattle, the harvest, and of the Waters.
First Legends season finale to take place in the present day.