Continuity mistake: In the intro, Zoe appears all of a sudden by the stage entrance; the other two models were on the runway with nobody there before the cut. (00:00:15)
Continuity mistake: Sadie Mernier tells the police about the victim's stalker. In close-ups, her large hoop earring is caught between her hand and her face. Camera further back, and the earring is on the outside. (00:09:35)
Continuity mistake: When Humphrey turns towards Florence to mutter instructions about checking the case with the UK police, Joséphine Jobert's hand is positioned on the top side of the notepad, and in a different position at the cut. (00:09:50)
Continuity mistake: Humphrey and Florence are checking out of the crime scene the morning after. When Florence says "Also, if she's telling the truth" the pen did a 180° turn in her hand; it had the ballpoint up, now it has the cap. (00:10:45)
Continuity mistake: Rosey Fabrice visits the police station the morning after the murder. Dwayne puts his moves on her and places his hand on the back of her chair, but in the close-ups his arm and hand are simply not there. (00:12:10)
Continuity mistake: DI Humphrey Goodman writes the name of the victim on the whiteboard, in a close-up. He then starts enumerating the suspects, but the name changed penmanship - look at the odd shape of the E linked to the previous letter, or the suddenly shallow M. (00:13:50)
Other mistake: Florence closes her notepad and puts the cap back on the pen when Dwayne just begun telling everyone what the Gendarmerie reported about one of the suspects. She has no way to know by that point what Dwayne is about to disclose, and that Humphrey is about to leave with her. (00:17:05)
Continuity mistake: Florence walks towards Goodman reading the post-mortem results; before the cut, you can see Kris Marshall's chin leaning on his right hand, but he has the opposite hand up and the right one down when he comments on the 'small mercies'. (00:23:20)
Continuity mistake: Florence advises Humphrey to "just be yourself." The slice of lemon is on (her) left side of the glass. Reverse shot and it's the right side, then it is back on the left side, where it remains for the rest of the scene. (00:28:35)
Continuity mistake: Humphrey sat down with the photographer, and asks him about the incident that bankrupted his previous agency. He says "Of course I would", scowling and putting the right hand on his left arm. Reverse shot, and his hand is on his knee. (00:34:05)
Continuity mistake: In an uncharacteristic display of authority, Humphrey orders Sadie Mernier to go back to her chair and answer the rather personal questions. She walks back with her shades in her right hand, and in the shot when she slumps back in the chair, the sunglasses are in the left. (00:37:10)
Continuity mistake: When Humphrey sits at the killer's table, they have the right hand on the left elbow in the first shot, both arms forward in the next. (00:45:55)
Continuity mistake: Dwayne's bottle of Etensel is facing opposite directions when he tries to act as if he didn't see his boss embarrass himself at the bar; the label faces the camera when the camera is to his right, and to his left. (00:50:35)
Continuity mistake: After the mishap at the bar counter, Humphrey reunites with Dwayne and Florence. He puts the glass on the table when he sits down, but in the next shot he's still holding it and only after a while he puts it back down. (00:50:40)
Continuity mistake: At the end of the episode, Catherine hands Humphrey the rag held in two different ways in the separate shots. (00:50:45)
Answer: There's probably no particular reason. Sets and props on long-running TV shows often change as needed and for various reasons throughout a series run.
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