Continuity mistake: At the end of the first interview with the suspects, Florence caps Humprey's thank you to the helpful staffers with a rather unsubtle eyeroll. She changes position lowering the pen, that is on the other side and higher in the following shot, last of the scene. (00:15:00)
Continuity mistake: Florence hands to her boss the freshly printed picture of Elliot Taylor using opposite hands in the shot and its reverse. (00:15:30)
Continuity mistake: Dwayne passes Humphrey the bagged notepad with a UK phone number scribbled on it. In close-up he is holding it with one hand. In the next shot his lips are still moving and yet he is holding it with two hands. (00:17:10)
Continuity mistake: When Humphrey puts the ancient cigarette packet under Dwayne's nose, his hand is on the top, bottom, top corner. (00:20:55)
Character mistake: The web listing for the Brompton cigarettes says that they went through a "rerevival." It's a typo, not a colourful way to say for instance "second revival". (00:24:10)
Continuity mistake: While Florence is going through the humanitarian career choices of the victim with Humprey, Dwayne is having a phone conversation with the secretary of the solicitor (somehow not being disturbed by the others speaking loudly, and conveniently being heard only when he says bye). Next to him, there's a biro pen at the side of a notepad. Change of angle, and the pen is on top of the pad, and then again to the side of it. (00:24:45)
Continuity mistake: Dwayne answers to Humphrey about his splinter in a close-up. His hands are at a very much different distance than in the previous shot. (00:36:35)
Continuity mistake: Opening; a creepy dude puts his hand on the shoulder of the hero of the cricket game. In close-ups the hand is not on the polo's neck, in the intermediate wide shot it is right on it. (00:02:55)
Continuity mistake: Florence spots the camera inside the cricket club's bar and points at it as she goes to fetch it. Points with her right hand, becoming the left hand at the cut. (00:11:20)
Continuity mistake: This is one of those episodes where names of the suspects on the whiteboard they look different under different angles. The horizontal stroke of the J in "Jerome Martin" is touching the hook, or not, the B in "Sabrina Martin" is different, etc. (00:13:15)
Continuity mistake: Goodman rushes out of the police station after spying someone tampering with the jeep. First time we see the various market stalls in front of the station, and two women are moving from one stall to another; one of them is wearing a sleeveless pink dress and has her hair in a bun. Humphrey arrives by the jeep in the next shot, and the two are back to the same stall they departed from earlier. (00:17:35)
Other mistake: In the bank statement that Dwayne hands to the DI, there are cash withdrawals "from the past three months", with the past three months being January, February and...February, again. (00:20:30)
Continuity mistake: Evening at Humphrey's; Goodman and the two French main characters are looking at the unlikely pair of the Commissioner and Martha being drinking buddies. Florence is looking over her left shoulder in a pinup pose, but she is turned right in the reverse shot. (00:29:45)
Character mistake: Florence says that Commissioner Selwyn Patterson and Martha are halfway through the bottle, but the bottle is practically empty. (00:29:55)
Other mistake: Torey Martin says that he had an accident 5 months before, but the car crash evaluation is signed 31/07/2016. Not only it was a Sunday - unlikely day for the car shop to be working -, but that would put the events of the episode on January, contradicting the bank statements and what was established in previous episodes.
Plot hole: The big climax of the episode involves Humphrey arriving at 1 PM to escort Martha to the airport as he promised, finding the shack empty with a parting letter from her and rushing on Dwayne's motorbike to catch her plane, failing to do so. All very cinematic, but that means that had Martha not left early, she could have not caught the plane at all.
Continuity mistake: During Dwayne's annual appraisal, Humphrey holds a bic pen that faces different directions in the reverse shots (easy to tell from the cap being on opposite sides). At the end of it he removes his hand from the desk, but it is back at the middle of the questionnaire in the next shot. (00:00:50)
Continuity mistake: Humphrey passes the bridge and meets by chance the distressed ginger; when he startles her, the phone instantaneously switches from right to left hand. (00:03:40)
Other mistake: The police boat approaches the scenes of the crime coming in from the right, in a straight line, then in the proximity of the boat they turn around it, moving clockwise, passing in front of the bow and then to the left side. When they review the readings though, the icons show a completely different story, as if the police boat approached from behind and they boarded docking right at the stern. (00:04:40 - 00:08:00)
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.