When Nigel plays the 7 inch single towards the end of the drama, he pulls out a record with a 'Harvest' label. Dusty Springfield was never on this label.
In the opening scene, Nigel states that his mother had an aversion to fresh vegetables and that he has "never had a vegetable that didn't come in a tin," but in the picnic scene at the beach the family clearly has fresh butter lettuce leaves and half a tomato in their lunch, and they have vegetables planted in their garden in the back yard.