Thing is, I actually know how this happens. I've caused a few of these moments myself. You send your changes in to the storyboard guy. Wait. It's not right, send more changes. Wait. Still not right. Fed up waiting, you decide to just give a note to the animator.
But nobody ever actually gives a note to the animator.
So the scene is animated, and it's completely wrong. Okay, so if you're getting paid by the hour, who really cares? Well, I care. I don't like doing things twice. Ever.
But then who does like doing things twice? Twins? That Two-Face guy from Batman?