As website Eurogamer points out, "Browncoats" is a reference to Fillion's previous show, sci-fi cult program Firefly. "Castillions" is a reference to his current show, Castle.
The Uncharted film will be helmed by David O Russel of Three Kings and screaming at Lily Tomlin fame.
Nolan North does the voice acting for Uncharted's Nathan Drake, but the character's film counterpart has yet to be cast.