Continuity mistake: Officer Dwayne Myers pulls the shades from the sock; he is holding them in a different way between shot and reverse (fingers on the lens vs fingers on the hinge). (00:12:00)
Continuity mistake: Office scene with the poison being revealed. Dwayne in his snazzy detective suit interjects that you have to know the right, or wrong people to get a hold of it. In the wider shot (whole room in frame) Danny John-Jules' left hand covers the cuff of his blue shirt, while in the closer angle the shirt is perfectly visible. (00:13:50)
Continuity mistake: After mentioning the Dutch poker player, JP waves around the calling card of the taxi driver. He holds it vertically when seen from behind, horizontally in the front shot. (00:27:50)
Continuity mistake: During the questioning of "professor" Eugene Sutton, his hand is flat on the table in front views, with the side down in the reverse angle. (00:34:00)
Continuity mistake: During the denouement, the natural light on the poker table changes continuously between shots. (00:41:45)
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.