Chester asks if Barry has a Flashmobile, which he has had at various times in the comics.
Cecile's powers have evolved to the point she can even control heart rates by manipulating emotion, which she does to calm Ultraviolet during surgery.
This is the first episode to feature Nora West-Allen since her departure as a series regular.
The Babel Protocol is used to protect S.T.A.R. labs again, having previously been used in The Last Temptation of Barry Allen, Pt. 2 (2019).