Episode #1.1 - S1-E1
Other mistake: The German officer in the pub is described in the credits as an unteroffizier (corporal or, generically, NCO). He actually wears the uniform of an oberleutnant (lieutenant), a commissioned officer.
SS-GB (2016)
1 other mistake in Episode #1.1
Starring: Andrew Bicknell, Michael Epp, Trevor White, William Meredith
Factual error: The constables working at Scotland Yard are wearing the divisional letter 'S'. 'S' Division covered North West London, including Hampstead, Hendon and Golders Green. Its men wouldn't have been anywhere near Scotland Yard.