Since I don't want to open separate topics for these questions, I'll put them here.
1. I always see some garbled graphics when I open any SMB.nes in YY-CHR. What are they for?
2. How can I point a sprite to a different palette, specifically Luigi?
And another important information is I'm using "Super Mario Bros. (W) [!].nes" ROM just in case you give solutions that apply to other versions of the ROM.