Continuity mistake: At the end of the episode Commissioner Selwyn Patterson warns Dwayne against equating him to farmyard animals. His hat switches hands during the scene, as you can see when he turns around to leave, and his left arm is down his side instead of bouncing the hat as shown in the next shot. (00:49:50)
Continuity mistake: During the denouement, in the close-ups of Mayor Joseph Richards he and especially JP in the background have strongly sunlit areas over their bodies. In the wider angles, the set is uniformly in shadows. (00:46:30)
Continuity mistake: When Richard has the epiphany about the case with the realization about the mayor, he keeps looking left and right and babbling with both markers in hand. The white one though in some shots has its red lid on, and in others hasn't. (00:32:00)
Continuity mistake: The whole sequence with Humphrey doing his 'visually aided' re-enactment of the night of the murder contains little shot-to-shot inconsistencies from the moment he takes the second whiteboard on. The photo switches hand, he leans to the top of the board when it's time to stick the picture on it, but the same hand is lower on the board at the cut, and so on; in some shots he's touching the board and in their reverse angles he is not. (00:35:40)
Continuity mistake: Martha and Florence are chatting in front of two glasses of wine, courtesy of Catherine. Martha's hand is at a different height, higher on the stem of the glass in one angle, lower against its base in the other main angle the scene is shot under. (00:20:35)
Continuity mistake: Florence and Humphrey take a walk with Emer Byrne. Behind them, a man with a rather noticeable orange T-shirt. Later in the scene when they go back to the jeep, the same man appears again together with the other guy he was chatting with, again walking back and forth just to pad the background. (00:16:00)
Continuity mistake: When Humphrey points out of the strangely lacking item amongst those lined up, the items in question change position between shots; when there's the shot of the whole row, the canteen is at an angle, it is parallel to the rest when the camera pans in close-up. The sandwich bag too is folded differently. (00:06:00)
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.