I really do not see anything significant on the first two, post mint damage and lighting glare. The third one however could be an overdate or doubling at the 7-8 O'clock position on the 6. Or, just maybe it is a small Cud. That is about all I can tell you but I am nowhere near an expert on these kind of things.
By MD, he means " Machine Doubling". Which is the least desirable form of doubling. It is considered post-mint damage by most, but some would argue it's part of the minting process.
Anyway. I don't see anything on the '58.
I don't think the '52-D has an "S" under there. Your mintmark looks too tilted. That's not to say that it's not an RPM, though. These can fool you sometimes. Chuck or coop would know at a glance.
I would lean toward die chip on the '56, too. But, definitely wait for other opinions on that.
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