Episode #3.2 - S3-E2
Continuity mistake: When Camille and Humphrey discuss the 'tea debacle', the yellow cup changes the direction it is facing (look at the handle) several times between shots. The folder of case files she puts on his desk changes direction as well. (00:40:35)
Episode #3.2 - S3-E2
Continuity mistake: Humphrey is doing his Humphrey thing coming up with the solution. He screams "That's it!" In a close-up of the mug on the desk, with a coaster in front of it. But he just pushed the mug aside in the previous shot, close to the chocolate card. (00:42:30)
Episode #3.2 - S3-E2
Continuity mistake: When Humphrey asks Camille to "do that thing" he "rather enjoyed last time", Sara Martins has her right arm on the desk in the close-ups but she drops it in her lap in the wider angle. (00:42:45)
Episode #3.2 - S3-E2
Continuity mistake: At the beginning of the denouement, the hand of Michelle Ryan goes randomly off the table in her close-up, being on it the rest of the time. (00:43:10)
Episode #3.2 - S3-E2
Continuity mistake: Humph brags about how he discovered about the affair from a cup of tea; in a wide shot of the whole room he then says "Which is also how I figured out..."; in the background, walking left to right is the same man in cream tank and black bandanna that was already doing the same as an extra earlier in the reveal scene ("It was all a deception, of course") and vanishes in the next shot. (00:43:25 - 00:44:25)
Episode #3.2 - S3-E2
Continuity mistake: When Humph says."was the intended victim all along", a walking extra in a grey hat quickly pops in view, and disappears in the next shot. He appears again walking in the same direction a couple cuts later, when Dwayne hunches over the trunk (which would be far behind the first point we saw him at). (00:45:00)
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.