When Shaun, Barbara and Phillip are arguing about what they should do Phillip says he doesnt want to go to the doctor because he ran the wound under a cold tap and had his jabs when he went to the Isle of Wight, and Barbara wont leave without Phillip the sound of a boiling kettle can be heard in the background this is a reference to the Approaching Train sound effect in the Godfathers restaurant scene, and is used as a way of ramping up the tension.