Episode #3.5 - S3-E5
Continuity mistake: When driving to the crime scene, the vehicles seen in the wing mirror are constantly appearing and disappearing instantly.
Episode #3.3 - S3-E3
Continuity mistake: The "E" that Humphry attaches to the whiteboard on a post it note changes design between shots. (00:14:30)
Episode #3.2 - S3-E2
Continuity mistake: When they find out that the chocolates are poisoned, Camile puts the label down. Camera cuts and she does it again. (00:08:40)
Episode #3.8 - S3-E8
Continuity mistake: When the murderer is revealed, they cry admitting implicitly their guilt. Mascara runs down their cheek, but its trails disappear between shots, and changed are also the smears on the lower eyelid. (00:47:45)
Episode #3.8 - S3-E8
Continuity mistake: In a rather blatant continuity mistake, Humphrey starts seated with his wife and two cocktails, which become a single cocktail glass when Dwayne and Fidel barge in. (00:35:00)
Episode #3.8 - S3-E8
Other mistake: The timestamps on the CCTV screenshots indicate that the murder happened in early March (since they are from early February and they go back one month), but March already passed in previous episodes of the same season (gigolo calendar, bank statements). (00:29:00)
Episode #3.8 - S3-E8
Continuity mistake: Fidel is reporting the background checks on everyone. When Camille asks him "What about the manager?" suddenly DI Humphrey Goodman has in hand the marker he was not holding a moment before. (00:18:20)
Episode #3.8 - S3-E8
Continuity mistake: When the severely confused Humphrey asks "What are we doing?" Sgt. Bordey points at the car; in the first shot she points and lowers her hand, but in the next shot the hand is still up and pointing. (00:12:30)
Episode #3.8 - S3-E8
Continuity mistake: Talking about the Chambers in front of the station prior of the surprise arrival of his wife, Humph gesticulates with his left, right, left hand depending on the camera angle. (00:10:50)
Episode #3.8 - S3-E8
Continuity mistake: DI Humphrey Goodman asks if everyone met the victim for the first time in Saint Marie. Pam Chandler has one hand on the table, but as her husband Jim answers for her, she has them both up, joined above the table. (00:07:25)
Episode #3.8 - S3-E8
Continuity mistake: In the preliminary interview with the suspects, Colin Campbell is talking about the concert he accompanied the victim to. Depending on the camera angle, the shadows on the table change, in a larger and uninterrupted area in the overhead shot. (00:06:50)
Episode #3.8 - S3-E8
Continuity mistake: Emma is late for the party; Jim says that maybe he should go check on her, to which his wife goes "Whaaat?" Notice the straw in her drink, pointed to her right. New shot, and it is pointing left. And when the guys scuttle away, the straws in her glass are two. (00:02:15)
Episode #3.8 - S3-E8
Continuity mistake: Tech-savy Jim is asked to fix the wi-fi in the intro of the episode. With a shark-like grin Pam Chandler replies he'll be "only too happy to help", and raises above her bosom the hand with the sunglasses. Jim passes her in the next shot, where her hand is low to the point of being out of frame. (00:01:20)
Episode #3.7 - S3-E7
Continuity mistake: When Goodman puts on the table the shotgun shell, it does not have on top the white stuffing shown in close-up and in the next wider angle. (00:46:25)
Episode #3.7 - S3-E7
Continuity mistake: Dwayne and Fidel rush to tell Humphrey that Joseph is missing. Kris Marshall has his fist raised in the second shot, but he had folded arms while turning around. (00:40:25)
Episode #3.7 - S3-E7
Continuity mistake: The timing of the scene when all of the 4 people who make the police force of Saint Marie reunite to check on Humphrey makes no real sense; there is no way that Fidel (but also Dwayne, even if at least there was a moment of contemplative silence before his arrival) couldn't have heard the chat going on in the room in the house at night being outside the open door. (00:39:20)
Episode #3.7 - S3-E7
Continuity mistake: In the more personal part of the conversation between Humphrey and Camille when he sits at the small table with her, the light flickers on Kris Marshall's face at different intensity depending on the camera angle used. (00:37:30)
Episode #3.7 - S3-E7
Continuity mistake: The scene with Humphrey and Camille sitting in front of each other with awkwardness and the guest bathroom story begins with him placing the paper on top of a book on the table. When he mentions the unconfortable family dinners, the book moved to the edge of the table without anyone coming near to it. (00:37:10)
Episode #3.7 - S3-E7
Continuity mistake: Goodman is involuntarily jumpscared by Camille while on watch. After pawing the papers away, he turns towards her. He is holding still, but in the next shot (focused on Sara Martins) he is turning and standing straight, again. (00:36:20)
Episode #3.7 - S3-E7
Continuity mistake: After the reveal of Emily's identity, she is shown with an overdramatic lighting and thunder effect, Behind here, nobody. Cut, and suddenly both Humphrey and Camille are standing there, behind, stalking her like horror slasher villains. (00:33:15)
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.
raywest ★