Sandra goes to a farm and finds the man she wants to interview, a vet, with his arm up a cow's rectum. She goes outside and then needs to wipe manure off her shoes. The vet comes out and Sandra says, "Not exactly Herriot country," referring to "All Creatures Great and Small." Det. Supt. Karen Hardwick, filling in for the injured members of the team, is portrayed by Lynda Bellingham, who played Helen Herriot on "All Creatures Great and Small."