A couple of diabetes 101 errors in this episode. Firstly, in the real world, the two main types of diabetes are referred to as 'Type 1' and 'Type 2', not A and B. Secondly, a type-one diabetic would never inject intravenously (as Mark Benton does in this episode) - diabetics typically inject into fatty areas of the body such as stomach, thighs, backside or back of upper arms.
The clay pigeon shooter pulls the same trigger twice to fire two shots. Each barrel has a different trigger.
The name of the train station, reflected in the train window, should be "mirrored", but is clearly readable.