I use Safari 7.03 for web development.
One thing I noticed is that the console log doesn't re-set on a reload of the page. You need to clear it manually.
So if you run a page with a JS error, it shows, then you fix the error in your JS code and reload the page and the error is still in the log -- but it's from the LAST time.
Chrome clears the error log every time. Is this a setting in Safari somewhere?