
The 30-second trailer includes a voiceover by lead actor Grant Gustin, "My name is Barry Allen, and I am the fastest man alive." The quote appears to be a variation on the line that the Flash spoke--though in the Wally West incarnation of the character in those books--in nearly every issue of writer Mark Waid’s 1990s run with the character.
The THR article went on to conjecture that the additional voiceover "Inside your body could be a map to a whole new world," is a potential nod to the DC Multiverse, and an explanation as to how parallel content could exist in the TV show versus movie universe. Seems a bit of an intellectual leap of forethought for Hollywood execs, but then again, the trailer also flashes the tagline "Believe in the Impossible" at 0:21.