Earlier this month, director Guillermo Del Toro talked about his work on Justice League Dark, telling fans that his movie would be part of a shared universe and that DC has big plans for many more characters. This sparked a debate about whether or not DC's "shared universe" would extend to the television world as well, especially with rumors that both the Flash and Nightwing will appear on Arrow (and now the Flash in his own show) as well as in the upcoming Batman vs. Superman movie.
Recently Arrow producer Greg Berlanti was asked about this, and the answer seems to fall somewhere in the middle.
We haven't had any of those conversations other than to say, what characters are we allowed to use this year and advocate or request certain ones that are of interest to us. And every now and then, they'll say, 'You can't have that guy.' They don't say why, and we figure out why later on.
So it's not so much a coordination as it seems that someone is simply making sure they don't step on each others toes. Which could explain why we may see two different actors playing Nightwing if the character appears in the upcoming Batman vs. Superman movie.
Will this "shared" but not shared universe create confusion among fans?
Having an character represented by two different actors simultaneously is not something we've seen done very often. Sure, we are used to an actor being replaced or retiring from a role, ala Batman or the Hulk, but it's not as if they hired a different actor to play Nick Fury when he appeared on the Agents of SHIELD show for Marvel.
There is also the possibility that if they do decide to use these characters, they could see how they are received among fans first on Arrow and then decide whether or not to use the same actors for movie appearances. A hit television show does have a way of ingraining specific actors into the minds of fans. Stephen Amell, who currently plays Arrow, is certainly a fan favorite, has made no secret of the fact he'd love to play the character on the big screen if they wanted him in a Justice League movie.
It would certainly be beneficial if they could pull off using the same actors for both television and movie roles, especially when only guest appearances are involved. But that may be an expensive proposition for Warner Bros. at the rate the two universes are currently expanding.