Conflicting OSX Free space between Finder and Disk Utility

I was fixing up a neighbours Macintosh and I suspect due to the disk being used up to 100% it ended up corrupting, and when I run disk verify/repair in Disk Utility it seems to work but we still see the free space reported between Finder and Disk Utility being incorrect. Check out the picture below to see what I mean.

osx-disk-space-oops_21_mar_2014

Never and I repeat, never fill up your boot volume on OSX as you will cause lots of problems. I suspect this machine that had this issue will need to be formatted and reinstalled to correct the condition.