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 - chronological order
Starring: Mark Williams, Nancy Carroll, Alex Price, Sorcha Cusack
The Sins of the Father - S4-E9
Factual error: A character is revealed as having been hypnotised into committing murder against their will. This is not possible. (00:05:20)