In a scene toward the end of the movie when the stepmother and stepdaughters are talking, the hair in the center of one of the stepmother's eyebrows is brushed up, camera goes to one of the girls then back to the stepmother and her eyebrow is perfect again!
Haven't you ever heard of stopping a scene to fix an eyebrow? It doesn't take a lot of time to smooth your eyebrow. You must've been really desperate for a slip-up.