While it is near impossible to tell, director Zack Snyder had a small cameo in Batman v Superman. And we do mean small.
BvS cinematographer Larry Fong revealed on Twitter that Snyder’s hands briefly doubled as Bruce Wayne quick scene. Or at least one part of Bruce Wayne.
— Larry Fong (@larryfong) January 1, 2017
During a montage sequence of Bruce Wayne researching Superman, Snyder’s hands doubling as Wayne’s grabbing a cell phone. With Snyder currently still making Justice League, perhaps he can continue doing hand cameos for Batman or perhaps even the Flash or Superman.