I saw a minnow or two had an air hole on the throat where the sprue was.I decided to paint them and tie them up to see if it effected the jig at all.Might leave a bubble trail or seem like it is an injured baitfish of some kind.????
I get them some times also. Some times the eye has a small gap between the flat part of the eye and the head also. May be from opening the mold to early for me.