* A sign on a broken cell at S.T.A.R. Labs says "Grodd". It is a certain reference to Gorilla Grodd who is yet to appear.
* When he's testing out his powers, Barry passes a truck for "Gambi Cleaners".
* The future newspaper viewed by Harrison Wells mentions Wayne Tech and Queen Enterprises.
* Several newspaper articles that appears in Barry's apartment are written by Evan Gibson, also an article from the future newspaper mentioned above was written by the same man.
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