Episode #3.1 - S3-E1
Continuity mistake: When DI Humphrey Goodman says "So, we're left with four friends", Dwayne behind him is holding some documents. Change of view, and he is leaning with both hands on the desk. (00:19:50)
Episode #3.1 - S3-E1
Factual error: In the close-up of the letter accompanying the package sent by DI Richard Poole's parents, their address is from Oadby, Leicester, with a postcode starting by OL9, which is the designation for Oldham, in Lancashire. (00:26:00)
Episode #3.1 - S3-E1
Continuity mistake: Camille has a moment of grief with her mom, but Humphrey arrives with "Ah, Dwayne said I'd find you here." Catherine turns around and puts her arm on the chair's back before the cut to a new shot, when she is still holding Camille's hand. Similarly, Camille then introduces Goodman leaning back with her arm on the back of the chair...or not, since in the wider angle her arm is down. (00:29:00)
Episode #3.1 - S3-E1
Continuity mistake: When Camille introduces Humphrey and her mother, the extras in the background make various gestures, with in particular the man at the right edge of the frame suddenly drinking off his bottle in the shot when Kris Marshall says "Thank you." (00:29:05)
Episode #3.1 - S3-E1
Continuity mistake: When Goodman makes the last guttural noise with his throat burnt by Catherine's rum, Camille's hand is in inconsistent positions between shots, at the side of her head or under the chin. (00:30:50)
Episode #3.1 - S3-E1
Revealing mistake: When Goodman looks at the two old pictures from the graduation ceremony side by side, they are blatantly photoshopped in a poor way; look at the way the characters stand out from the background, the light on the man on the right of the left pic, and there's even a frock or bag that two of the women carry that is a copy/paste from one picture to the other. (00:39:10)
Episode #3.1 - S3-E1
Continuity mistake: During the denouement, DI Humphrey Goodman repeatedly points his finger when he says that the "why" was "most elusive." The next shot has his arm completely still, close to the body, and from behind you can see he is not talking, just a little nod before the cut. (00:43:25)
Episode #3.1 - S3-E1
Plot hole: Humphrey never asked for the background check to be extended to the dead sister, but somehow he happens to have a copy of the shoplifting conviction from years before. Moreover, the proposed switch appears a stellar impossibility, since Sasha sold a multimillionaire company she herself founded and Helen is not her twin, but a sister younger by one year that looks 'a bit' like her; not exactly the kind of anonymous recluse who would never receive any visit, hook up with no former affiliate and make in any way plausible a recycled Christie plotline. (00:47:15)
Episode #3.1 - S3-E1
Continuity mistake: All the local crew is at Catherine's having beers - including Commissioner Selwyn Patterson in a very rare sighting without the uniform. The bottle of Tensel in front of Camille faces different directions between shots. (00:49:35)
Episode #3.1 - S3-E1
Audio problem: Camille invites Humphrey to have a drink with the crew. When he begins to say that "It'd be a bit awkward", Kris Marshall's lips don't match the audio in the brief cut when the camera is slightly behind him. (00:50:25)
Episode #3.2 - S3-E2
Continuity mistake: When we cut from the fake B-movie to 'reality', Lexi has both hands on her hips fixing the waistband, but she is hunched over with the baseball bat in her right hand in the new shot. (00:00:40)
Episode #3.2 - S3-E2
Continuity mistake: Lexi call the attention of the production assistant Susie for tea with her left hand, which turns into the right hand at the cut. (00:00:55)
Episode #3.2 - S3-E2
Continuity mistake: When the stand-in slumps to the ground, someone asks to get her some water. In that close-up, Thea's left arm straightens, but it's bent at the elbow in the next shot. In this new shot, there's also a zombie on the right of the screen that has his hand at his hips, but he is scratching his chin in the next one. (00:02:00)
Episode #3.2 - S3-E2
Continuity mistake: Humphrey arrives on the crime scene, by the body. Camille is putting gloves on; she has the right one and is in the midst of putting the left on, cut and she is gloveless putting the right on, cut again and she is putting the left on using her gloved right. (00:04:05)
Episode #3.2 - S3-E2
Continuity mistake: Fidel is showing the lack of oxygen to the victim'skin pointing at it with his right hand, a blue pen sticking from the fist at the top. At the cut when Humphrey says "Respiratory failure?" the pen is not sticking. (00:04:15)
Episode #3.2 - S3-E2
Continuity mistake: In the catering shack, Humphrey does his thing when he start scribbling on random pieces of paper. When he steps behind Camille to go fetch the paper towel, depending on the camera angle Camille is holding her own notepad in separate ways on a different tilt that matches the separate matching camera angles. Walking extras carry over from matching camera angles as well, disappearing when it cuts to a different one. (00:04:55)
Episode #3.2 - S3-E2
Continuity mistake: There's a close-up of the empty box of chocolates as DI Humphrey Goodman reviews the content of the catering table. The close-up is not from the same arrangement seen in the rest of the scene; the angle is slightly off and it is missing a used towel next to one of the two paper cups. The fork is also pointed in the opposite direction. (00:05:05)
Episode #3.2 - S3-E2
Continuity mistake: Right after the brief flashback with Thea Holmes bringing pizza to Lexi Cunningham, watch out for an extra with a red band holding her hair in a bun; she walks behind Camille. One more cut and she's notably passing by again, on the opposite side. The same person is suddenly in frame again, again passing by DS Bordey, several seconds later into the conversation. (00:05:45)
Episode #3.2 - S3-E2
Continuity mistake: When Dwayne calls Goodman's attention for the tox report, Camille is pulling some clothes out of the bag of the deceased, but at the cut the clothes turn into a water bottle. (00:07:55)
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)
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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