The internet has so very many people thinking anything odd looking on a coin means the coin was made that way. But when those people see a car with a broken window, they don't try to figure out what went wrong at the car plant.
Don't waste time looking for oddities, instead look for what the hobby actually collects. Most of what you will find that is odd will be post mint damage.
Also spend some initial time at places like error-ref.com, doubleddie.com, varietyvista.com, conecaonline.org, coppercoins.com etc. to find what actual and collectable coin errors look like.
A good way to start is, for instance, 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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