For some reason, Marie Antoinette looks exactly like Nora. This implies that she is descended from her, though whether it's through Damien Darhk or Ruvé Adams is unknown. As a result, Ray Palmer theorized that Antoinette is the ancestor of Nora, suggesting that the latter perform a DNA test via 23andMe.
This episode takes place simultaneously at the events of Fadeout (2020), which explains Sara's absence from most of this episode.
Zari continues the tradition of new (relative to the crew) Legends causing trouble with the timeline almost immediately after joining.
DJ S'more Money is a parody to the American electronic DJ Marshmello.