All of the rifles were bolt action rifles, but several times the sound of continuous fire from a single weapon is heard. Also because a bolt action rifle has no buffer spring to absorb the recoil like a semi-automatic weapon has, no one showed any effects of recoil from firing their rifles.
When the revolutionary leader is on the ocean liner heading for China, the lifeboats on deck are too modern: they are painted bright orange and have built-in engines (note the propellers). The movie is set in 1911, so none of these characteristics would be present. Lifeboats of that era were rowboats, usually painted white.
When a man shoots another with a bolt action rifle, the sound of the empty cartridge hitting the floor can be heard. The bolt had not been cycled, so the empty cartridge can not have been ejected from the rifle.