This is Emily Kinney's first physical appearance in the series as Brie Larvan/Bug-eyed Bandit since the All Star Team Up (2015). However, she did appear in Beacon of Hope (2016).
Nora creates a fake ID to get into the McCulloch building, "Jenni Ognats," in the comics, Jenni is the young woman who holds the mantle of XS, as a speedster who also serves as part of the Legion of Super-Heroes. Back when Nora was nothing more than the show's "mystery girl," some had speculated that she could be Jenni, and she ultimately ended up being an amalgam of both her and Dawn Allen.
Ralph assumes that Caitlin is making a move on him, only for her to act with disgust over the notion a nod to how in Season 4, Ralph was meant to be Caitlin's love interest only for Panabaker to veto the idea.
The title card changes to Nora's lightning, albeit it is now purple and red due to her newfound connection to the Negative Speed Force.
One of the cross-streets mentioned by Team Flash being "34th and Williamson," a nod to Joshua Williamson, who has been writing The Flash comics since the Rebirth relaunch in 2016.