Hmm, well if it's a really light burn you can sometimes scrape it off a little with a sharp blade (but not digging into the wood of course). Or maybe some light sandpaper (not rough). That can sometimes mess up the wood if you do it too much though and it'd be harder to burn. But usually if you make a mistake, it's there to stay. You kind of just have to work around it if those other options don't work. Long story short, try not to make any mistakes. Haha