Factual error: Crown Court is referred to; unfortunately they didn't come into existence until 1972, nearly 20 years later. At the time of Father Brown they were 'Assizes'.
Father Brown (2013)
1 factual error in The Hangman's Demise
Starring: Mark Williams, Nancy Carroll, Alex Price, Sorcha Cusack
The Curse of the Aesthetic - S8-E8
Continuity mistake: When the nanny is found dead, the ball of wool in the bag is yellow but later on when Father Brown picks up the wool out of the bag it is grey.