The "circles" are simply rolling machine damage. As for the other anomaly, what you call a "5", I can't see it well enough to say for certain, but it is likely some form of damage as well unfortunately.
Someone in a machine shop tested a punch of the number 5 on it. Or they just did it for the fun of it.
Sorry but that isn't an error. It is referred to in numismatic terms as post mint damage. Meaning it was done after the cion left the mint. It appears to be counter stamped, (the number 5) though I can't tell you why or for what reason, except it wasn't done at the mint. The rings or circles on the coin are from a coin wrapper.
Thanks I'm a waitress and I get all kind of change and I know there could be something hiding one day
Also.. The 5 is much larger than any numerals used on current US coins. And it is incused into the field not above the field as current numerals. Size and depth are factors in the Post Mint Damage evaluation.
This is a metal punch set. Letters for this set as they have numbers also. Pick one, place it on the coin, then strike it hard with a hammer.