Error bills

I am a coin collector but if I see an old bill I will keep it. I don't have too many but I was wondering what some bill errors look like so I can keep an eye out

 

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You can see some at this website;

http://www.executivecurrency.com/collections/en.php

 

I have a few: http://www.clay-irving.com/currency/errors.html

 

I remember having one of the ones listed on Clay Irving Collection. It was the third one down. Still looking for the Number one position.