Factual error: The website of the toy manufacturer has as address for its store a location in Harrogate, but the ZIP code has an incorrect format, with the 4th character being an O and not a zero, and HG4 being the neighbouring Ripon. (00:28:30)
Factual error: Dwayne's phone during the intro says it's Saturday July 4th. The episodes (memorial banner, death certificate) takes place in 2016, when July 4th was a Monday.
Factual error: When JP shows the article from the Cowbridge Gazette, it is the Wednesday 22.01.16. January the 22nd was a Friday in 2016. Following article's date; Wednesday 2.2.2016. Actual 2.2.2016: a Tuesday. (00:15:25)
Factual error: The stratagem used to conceal the murder and disguise it as suicide is absurd from the start; it relies on the old trope of a gun "silenced" shooting through a pillow. It simply does not work, a gunshot in the early morning in the empty camp would have not been dulled down significantly by a pillow, and still be heard.
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.