Aside from it not being Chocolate Mint, I don't see anything wrong with the Mint. I see some bag marks/contact marks on the coin's surface. If you're talking ab out the 'flattened' S Mintmark, there's nothing that's an error on it, from what I can see in your photo. What do you see wrong with the Mint?
My dad used to collect them when he was a kid had some 1972 DD's but the government did a recall on them and he had to sell the ones he had my goal is to find one before he passes