Corrected entry: When the white van is at the airport getting its tires shot out we can see that there is water coming out of the exhaust. Water only comes out of the exhaust the first couple of minutes after a completely cold car is started due to the condensation. Warm cars do not have water coming out of the exhaust, and since the van was driven all the way to the casino and then to the airport there shouldn't be any water.
RJR99SS
7th Jun 2004
Correction: Not entirely true. It depends what the temperature difference between the exhaust and the outside air is. On cold days, and usually at night water will drip out of the tail pipe no matter if the car is hot because the cool outside air will cool off the ends of the exhausts pipe, letting water condensate inside. This scene does take place at night, and in the desert where it gets freezing at night.
RJR99SS