Other mistake: JP tells the others that his fiancée cooked him a great meal for the two-month anniversary the other night. Suddenly, the three months anniversary is coming up and he proposes - but just a day passed.
Other mistake: It is never clarified why the victim paid his brother; besides that, the bank statement has the date of April 29 and most facts point at the date being the one the episode is supposed to take place at. The investigative report though refers to a meeting happening in January - would hardly be something the aggressive legal team of the even more aggressive chef would keep on their desk for 3 months.
Other mistake: Dwayne goes through the deleted text messages in Robert's phone. The messages have as dates "Thursday 19" and "Saturday 21st." Given that the year is 2016, the dates are compatible with the month of May, but the episode is set on April 29 - it's the date on the police report for both Matt Holt's background check and the bank receipt Gary Holt shows. (00:19:25 - 00:29:45)
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.