The fifth photo is damage to the rim caused by a hit. As for everything else, I’m not seeing any errors and I have no idea what you mean by grading errors on the 1964 as it doesn’t looked graded because they are in your hand, not sealed in a professionally graded slab.
The shape? Round….. it’s not in awful shape at all, the 1964, some hits on Jefferson’s cheek that will lower the grade. I still might hold on to it though. Worthy of being in a flip, but not in a slab. for fun Google two things…. First Google the total mintage of 1964 nickels. Second, Google PCGS Photograde. Compare your nickel to the ones they have there, you’ll start to get a sense of how it grades. I think NGC has an online grading page as well if you’d rather use them. you’ll see a lot of opinions here at CT about when to send a coin to be graded, but most answers seem to be around $200-$300 in value.
Shiny but both show lots of circulation damage. One I know for sure has been cleaned. The shinier one, maybe cleaned since it's so shiny but with lots of circulation damage.
