In my experience quite some Euro coins come with similar small extra-metal or filled letters, numbers. But then again I tend to inspect every single coin I get as change (or buy) very carefully :)
As far as the G is concerned, from this picture, it also seems to me as post mint damage ... But what is there between second 0 and 8 in the date? Extra metal? Like this perhaps?

As far as the G is concerned, from this picture, it also seems to me as post mint damage ... But what is there between second 0 and 8 in the date? Extra metal? Like this perhaps?






















