The Daughter of Autolycus - S4-E5
Other mistake: Lady Felicia says "Ah, Father, how very propitious." The subtitles say "Ah, Father, how very capricious." (00:03:10)
Father Brown (2013)
1 other mistake in season 4
Starring: Mark Williams, Nancy Carroll, Alex Price, Sorcha Cusack
Factual error: A character is referred to in German as a she-devil, which is given as "sie teufel." This is German for the two words "she" and "devil" but not for the word "she-devil", which is "Weibsteufel." Or just "Teufelin." (00:32:15 - 00:33:20)