Factual error: Inspector Shaw is described as DI Shaw throughout. He isn't a detective inspector; he's a uniformed inspector, heading a shift of uniformed officers and always wearing uniform himself.
Factual error: Both Inspector Shaw and Chief Inspector Bailie wear their medal ribbons in the wrong order. The Golden Jubilee Medal is worn first, followed by the Diamond Jubilee Medal, followed by (for Bailie) the Long Service and Good Conduct Medal.
