Continuity mistake: When Victoria first arrives in 1790, she "translates" the three mystic symbols on her dress label for Abigail, saying that they mean "Machine Wash, Tumble Dry and Low Iron." But when Abigail shows the dress to Reverend Trask, she tells him that Victoria told her the symbols meant "Tumble Dry, Low Iron and Permanent Press." Victoria never mentioned Permanent Press.
Continuity mistake: When Julia comes to the Old House to confront Barnabas, Willie lights a tier of four candles, but one goes out again, leaving only three burning. In full shot, candle 4 remains unlit. In a close-up from the same angle, candle 4 is burning and 3 is unlit.
Continuity mistake: When Joshua says that he won't send Naomi away because Collinwood is her home, the actor mispronounces the mansion's name as "Collingwood." Definitely not a character choice: Joshua, who founded the Collins family dynasty, would neither forget nor mispronounce the name of his own estate.