Sketchy...the snail adjusters being off would allow an easy derail in itself. If the scratches are very very minimal then a buffing compound and chamois, but it is likely deep and for the swing arm it sounds like you need some bondo body fill, sand, prime, repeat, and paint. If you can match the color then you can just focus on the area that is damaged.
I don't think I'd worry about anything cosmetic for the sprocket since it will be replaced eventually.
I had my chain derail once and the only noticeable damaged seems to be a crack in the engine case above the front sprocket....I noticed it long after but I can't see any other reason for it being there.