Just to add a little further clarification for anybody else who's wondering the same thing (as I was) about the original second question:
The first time Johnny is loading the cannon, we see him put a couple handfuls of gunpowder down the barrel of the cannon, and then something about the size of a cannonball, but it's not a cannonball. This is the wadding for the cannon, and the reason you put it in has to do with the nature of the explosion going on in the cannon behind the ball itself. Without going into too much detail, the small amount of powder that Johnny put in the cannon is just going to sit at the bottom of the barrel, and the resulting explosion is mostly going to be applied to the bottom of the ball, which would not make the cannonball go as far.
The wadding is there to make the explosion push more "out" on the ball than "up", and also to keep the flame of the gunpowder flash from making contact with the explosives inside the cannonball itself (a potentially dangerous situation). Most firearms of the time used wadding, which is probably why Johnny knew to put the wadding in the cannon in the first place. It loaded just like the average rifle.
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