Continuity mistake: Right at the beginning of the episode a Cadillac Escalade gets stolen. The car is the newest model. The chase begins and the car is a new model right up to a scene when they crash into some other cars. That part was filmed with older model Cadillac. The damage is quite severe, but the chase continues again with the new model that has only one bit of damage - a mirror that has come apart.
Continuity mistake: Norma reaches over to touch Chick's walking stick with her right hand, but the next shot shows her using her left hand.
Continuity mistake: Elizabeth's hand on Gabriel's arm changes positions shot to shot.
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.
Continuity mistake: Peter and Roman dig up Lisa's corpse to steal internal organs. When they cut her open blood and fluids gush from the wound. A vehicle approaches, forcing the two to flee the scene. The Sheriff and Dr. Chasseur, who arrived in the vehicle, view Lisa's corpse a few seconds later and there is no blood on or around the body.