Danny's friend Greg's "body" is very obviously breathing when the golf ball rolls up to him during the opening scene.
During the scene where Danny and Mary are pondering the broken wave pool, you can clearly see the Mandalay Bay tower behind them. Much of the series's exterior shots were filmed at Mandalay.
During the scene where Mike and Danny are talking at the valet station, the Sphinx from the Luxor can clearly be seen in the background. From the angle shown, the valet station can only be the station at Mandalay Bay. In addition, the sign on the wall in the valet station says "House of Blues" with an arrow pointing toward the door. The House of Blues, Las Vegas is located within the Mandalay Bay as well.