Continuity mistake: Archer is at various times described as chief superintendent (a rank which wasn't introduced until 1949), superintendent and inspector. Nobody, including him, seems to know what his actual rank is.
SS-GB (2016)
1 continuity mistake in show generally - chronological order
Starring: Andrew Bicknell, Michael Epp, Trevor White, William Meredith
Factual error: Although he is openly an SD officer, Huth does not wear the SD insignia on his cuff.