Serenity - Magic Bow & Arrow
During the battle between the crew and the Reavers, just as Zoe fires her shotgun for the first time, Inara is in the background, holding a normal bow and arrow. Throughout the rest of the scene, Inara is using a more advanced/fancier bolt thrower. The bow and arrow was the original weapon used, but it was replaced in post-production due to test audience reactions. They apparently missed a bit of it.