The scene where Ben Field looks up at the crematorium chimney and sees smoke pluming out is factually inaccurate - in the UK (where this story is set) it has been a legal requirement for all crematoria to have filters and abatement equipment fitted to their exhaust systems since 1998. This prevents heat and smoke being discharged to the atmosphere. The events in this case happened since 2015, therefore this could not have been the case.