When Jerry and Nick enter their cabin from the hallway, they have passed by the first set of cabins at the end of the hallway. Hector enters their room from the opposite direction, demonstrating that they are in a cabin with cabins on each side. The cabin map on the door of their cabin shows them to be in an end cabin on the other side of the hallway.
When Felicia is out on the balcony showing off to the man detailing her BMW she is out on a balcony on the top floor. In the next shot the windows behind her changed and we can see stairs in the room she walks into.
When Inga talking to Nick on the deck when he was talking about rubbing lotion on them because he was so gay. The rainbow towel, the guy is laying on, in chair, in background, comes and goes several times.
In the end of the movie when character Nick travels to Sweden looking for Inga, the location he travels to is meant to be Sweden but is in fact Switzerland. The outdoor shot are the Swiss alps and Inga's family is wearing traditional Swiss/German clothes, for example her father wears lederhosen.