Continuity mistake: When Erik enters his father's office the clock on the wall shows 5.10pm. After they have been talking for a couple of minutes the clock still shows 5.10pm.
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: Harold Alexander, although his rank of major-general is correctly mentioned by the narrator, wears the rank insignia of a full general.