Grant Gustin Gives Out Bunny Ears on 'The Flash' Set!

Grant Gustin shows off his playful side while giving bunny ears to a crew member during a break from filming scenes for The Flash on Monday (March 23) in Vancouver, Canada.

During this week’s episode of the show, the 25-year-old actor’s character Barry Allen set off a series of events due to traveling back in time, causing a butterfly effect.

“It’s really important for Barry to know that [things can change] as he heads into the end of the year,” executive producer Greg Berlanti told EW. “Our real goal with the episode, more than anything actually, was to establish the rules for our own show in terms of time travel and to introducing those elements and characters early enough into the DNA of what The Flash is, because I don’t think you can do a Flash show without dealing with time travel.”