Eve tries to sober Cassandra up by making her drink coffee. This wouldn't have worked even without magical interference. The sobering effects of coffee are a medical myth. At best, the caffeine will make a drunk person feel and maybe even seem more alert, but they won't be any less drunk.
When asked how much his drink costs Ezekial replies "Three hundred quid," but his mouth is clearly saying something other than "quid".
The English waitress in London said her son was on a footballer's scholarship. British universities don't offer these. She then said the club her son delivered to was a few blocks away. London has such a haphazard street layout, distance is not given in blocks.