Factual error: Emer Byrne's Irish passport is fake. Look at the expiration date; the day of that date does not match the date of issue. A passport issued on September 24 wouldn't expire on September 01 as seen there, but on September 23. (00:16:15)
Factual error: When Humphrey makes the big reveal opening the suitcase full of cash, it's a bunch of wad of bills, each with the currency straps indicating a value of 50,000 (Eastern Caribbean) dollars. Thing is, it's all in $50 notes, which means there should be 1,000 bills in each wad, which is obviously not the case. (00:47:20)
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.