I was farming for the rare 1 star, 2 star, and 3 star weapons earlier when I noticed something that I haven't found to be noticed by the Dynasty Warriors 8 internet community so far; interim saving affects the chance of obtaining rare weapons and obtaining / upgrading skills.
I noticed this when I was farming on Battle Of Baidi Castle, and I was saving just before I fought a playable officer each time. Each time I did this I noticed it was taking more and more "quit and reloads" to get a rare weapon. I also noticed that the difficulty bonus at the end of a level went right down; on an unsaved run through the level I got about 600 bonus EXP, on a run through where I saved and reloaded many times and still killed the same amount of enemies and officers I only got about 50 bonus EXP.
The only thing I'm not sure of is if it is the saving or the loading that affects this. Can someone please confirm?