When listening to you explanation I remember myself sometimes when watching movies and it is really often in series you see on some shots from front both characters faces and that their are smiling then the shot from the side but then one of the character is not smiling at that moment and even looking somewhere else. But the third time they are both back to the first position. That is really annoying for viewers. Thank you for this informative video, just now it is clear what scripty for.