At the beginning of the episode, the marquee on the Vogue theatre shows, "Blue Devil II - Hell To Pay" and "The Rita Farr Story."
It reflects two DC Comics superhero characters: Blue Devil, a movie stuntman turned real demon; and Rita Farr, or Elasti-Girl, a famous movie actress and member of the Doom Patrol.
When Barry makes a crack about the town building him a museum, this is a nod to the actual Flash Museum from the comics.
To obscure his identity, Barry vibrates his face into a blur. This is how the comic book first Flash used to keep his identity a secret before the second had a mask.
At the beginning of the episode when Barry and Iris are leaving the theater they walk over an advertisement on the ground for the Marvel film Captain America: The Winter Soldier (2014). Marvel and DC, which produces the comics on which this series is based, are rival comic book conglomerates.