When Barry wakes up after fighting Eva, you can see that he is wearing "PF Flyers" - shoes "guaranteed to make you run faster and jump higher."
This episode confirms the fate of Hannibal Bates post-crisis as he is mentioned when Barry is telling Cecile that he thinks the fake Iris is a shapeshifter.
Mirror Iris morphs her arms into blades similar looking in appearance to the T-1000 from Terminator 2: Judgment Day (1991).
When Barry mentioned Plastoids, it became unclear if they exist on Earth-Prime or are simply another known Multiverse Refugee.
This marks the return of Sendhil Ramamurthy as Ramsey Rosso. He was last seen in The Last Temptation of Barry Allen, Pt. 2 (2019).