Corrected entry: Towards the end, Vince and his wife are by the waterfall (which I would like to comment is behind them; not sure what contractor would position the seats that way), he brings a six pack of Budweiser in a bottle. The problem is the island they are on has no stores to purchase this. You could argue that he got this from the bar, but a bar would purchase in bulk and thus would not have the little cardboard six pack holder.
Corrected entry: During the "nude" scene on the beach, when Shane is asked to drop his drawers, he wears shorts initially, but then in a subsequent shot right before the "reveal", he is wearing pants.
Correction: Is there any wide shot version dvd that shows the shorts? I never saw him wearing shorts.
Correction: This is an island resort specifically geared towards partying. It's not outside the realm of plausible to think that somewhere on the island, there may be a place to purchase alcohol in order to take back to rooms for after parties and the like. Since cuts don't necessarily take place in real time, we don't know how long they take getting back to the waterfall, and thus they could have gone practically anywhere in search of booze.
Morte