Odd Rigging Problem

#1

Hey, So I binded my mesh to a skeleton, no problem. animated it and started weight painting. after completing it now when animating maybe 7 random vetices move around like crazy, and they even change where they move to. I have gone over weight painting again and cannot find any odd influences that might be doing this. please help me figure out what is going on, maya keeps doing weird things like this and it is really frustrating