Regarding the hologram around the edges of the 2014's... my very first pieces - maybe the first couple hundred pieces, the rings (which serve as a security feature) ended up clamping down too tight around the edges of the holograms, and in time it has caused the adhesive around the very edges of the holograms to come unstuck. This was fixed by later adding 4 extremely small and thin washers to each coin.
I believe that is what is happening here, and I'm not sure if this might be seen as an 'error' or not, but it was certainly a design flaw that I did not consider early on - and when I began to notice it I made the small change to the design and added the washers.
That's interesting, so the first 200 or so of the 2014's are more rare (at least different) than the rest.