Early in the film the guards whip Joseph, they then attempt to burn his eyes out. The iron is heated by a character out of uniform who passes it to a soldier. We see the scene from the back and the soldier moves the iron towards the child's eyes, a cut to the front has the non uniformed character moving the iron towards the child's eyes, a cut back shows the iron back in the hands of the uniformed soldier.
In Balsamo's climactic escape attempt, Gitano passes him a pistol, seen very clearly as a small flintlock typical of the period. Balsamo then fires at least four shots from it without any time to reload. Repeating pistols not invented until the nineteenth century, and looked nothing like the gun used by Balsamo.