When Janet Fraser (Bernadine Reynolds, credited as "Ugly Sister") is glaring at Joanna (Cathy Tyson), her folded arms are higher up her body in wide shot than they are in mid shot.
The clearly apparent difference between Andrew Schofield's real age (25) and the age of his character (16) is brought into sharp focus when he tells Marie "I 'aven't even started shavin' yet" and rubs his dark chin to try to illustrate the point.