Continuity mistake: S4 E1 The Art of Open Fire Cooking - Chef Dale plates the Romesco from the cutting board to a white bowl. In the next shot, the Romesco is back on the cutting board. (00:15:41)
Plot hole: Ep 6 Ffion, with backing by a squad of police, is in a frantic search to find the killer's latest victim. She finds something and calls into headquarters, whereby the DCI says, "I'll send backup." She already has a swarm of police aiding in the search.