Why does the sum of data in subfolders not add to the top folder?

I am trying to remove folders in my primary drive of my MacPro so as to free-up space on the primary drive.  I have been using the Info button for each folder to see the total amount of data for that particular folder.  When I add up the data contained in each folder they sum to a substantially lower amount of Gigabytes that is shown by the info button for the top folder.  If you add the data shown in each of the top folders on the drive, the sum is considerable less than is shown for the drive in its info tab.  Why is there this difference in the sum of individual folders and the drive Gigabytes shown?  Is there data that is not apparent because hidden folders not shown in the Finder?

Suppose you had folder with three one-byte files in it. GetInfo reports three bytes in the folder. But each file takes a whole number of allocation blocks on the drive, probably something like 12K total.
Mac OS X also blurs exactly what is meant by a folder. For example, an Application is typically presented to you as one file, but if you look inside it, you would see that it may contain a hundred files in folders.
Some Users have reported better luck using OmniDiskSweeper (run as admin) to show how much real disk space is taken up by various items -- the GetInfo byte counts can be hard to deal with.

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