The internet has poeple thinkng all you have to do is find something odd looking and you have a mint error. The following friendly visual aid tells the facts:

To avoid the above and learn what to look for, get a box of penny rolls from the bank and separate the coins by date and mint mark. Go to varietyvista.com and, date by date, use the reference there to see what errors are known for that specific coin/mint mark. Look for those specific errors/varieties using the pictures provided. After doing this for awhile you will KNOW what an actual error looks like and not have to waste time on face value and damaged coins. :)
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