I know what you are talking about, I didn't remember if it was specific to lime green for me, but there always was a little glob of plastic off to one side, didn't bother me since the piece still fit, but that is a funny tidbit, it reminds me of every komau mask I got, each one had a very, very, VERY small little spot on the nose, almost impossible to see unless you look for it, but my copper one from the UK didn't have it, I found that quite hilarious, and I guess a good way to tell if the one I had was from the US or UK lol