Episode #2.8 - S2-E8
Audio problem: Vicky had just introduced herself to Camille when a gunshot is heard. Everyone reacts as you'd expect with such a loud and sudden noise exploded in the middle of a party, everyone except in a brief cut to Duncan Wood. Nobody in that shot is perturbed by the bang in the slightest. (00:02:50)
Episode #2.8 - S2-E8
Continuity mistake: Entering the house after the gunshot, Camille holds back Vicky Woodward with both hands, becoming one hand in the next shot. (00:03:00)
Episode #2.8 - S2-E8
Continuity mistake: In the first examination of the body, Fidel photographs the wound. Poole appears behind him and asks "So?"Behind Poole, you can see the air conditioning unit, turned off and with its grid closed. Seconds afterwards, Poole peeks above the desk and the plot point establishes that the A/C is running. (00:04:35)
Episode #2.8 - S2-E8
Continuity mistake: Checking out of the crime scene, Richard puts the plane ticket down after the interview with the PA is over. In close-up the ticket lands diagonally across the bottom side and the left side of the organizer, but in the shots of the room the ticket is placed on the top side of the page. (00:09:00)
Episode #2.8 - S2-E8
Continuity mistake: In the scene with Richard bossing Camille around with his brisk finger-waving, she is pinning in place the red tape using just two fingers pointed against the book or her hand hovering on top of it, clenched in a fist, depending on the angle. (00:09:50)
Episode #2.8 - S2-E8
Continuity mistake: Richard lifts the soft paper towards the UV light picking it with his tongs by the far corner - in the close-up the strip is pinched right in the middle of it, though. (00:24:25)
Episode #2.8 - S2-E8
Continuity mistake: During the denouement, DI Richard Poole holds the evidence bag with the murder weapon showing it to his audience. The bag is held differently between shots, as the blue bands make easy to spot. (00:37:35)
Episode #2.8 - S2-E8
Continuity mistake: When the murder is shown, the killer grabs the gun with both hands at first, then the close-up shows them pick the gun from the drawer with just the left hand. (00:39:40)
Episode #2.8 - S2-E8
Continuity mistake: When the killer walks away from the victim, his right arm touches the carpet in the first shot, is above it in the next, and was even further distant from it in the one before the opening roll of the episode. (00:40:00)
Episode #2.8 - S2-E8
Continuity mistake: In the whimsical finale, Richard rips away from Dwayne's hands the envelope with the test results; the envelope switches side multiple times between shots - just look at the stampings and how they change position from cut to cut. (00:42:40)
Episode #2.8 - S2-E8
Continuity mistake: Fidel grabs the envelope with his results. Brief reaction shot on Dwayne and Poole, and suddenly the beer bottle and Best's cell phone have rotated. (00:43:00)
Episode #2.8 - S2-E8
Other mistake: Richard states that all 33 of the prints he recovered from the cash wraps were by the victim, but we see the secretary in flashbacks collect them from the garbage bin with no gloves, which would leave obvious prints that can't be washed away - the presence of prints wouldn't even be all that incriminating per se, since it wouldn't be terribly strange for the personal assistant to momentarily handle some money inside her boss' office.
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)
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.