A lot of characters Jim interacts with later on are introduced in the film in the background much earlier. For instance, the 'Man on Scooter' is first seen behind Jim when they exit the very first ride, while the 'D' Team Leader who is not introduced until the end of the film, is seen looking up at Jim on the balcony 40 minutes earlier.
When Jim is talking to his boss on his cell phone, he looks down from the balcony. You can tell that their room is on a high floor. But when the family leaves the room and goes to the elevator it has a number 2 near the elevator door, indicating the scene was filmed in the 2nd floor hallway.