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 #3.1 - 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
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: 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
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: 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
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: 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
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: 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)
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.