 During the scene when Duke first arrives at the dirt bike race, it  is suppose to be dawn but you can tell from the lighting it  certainly isnt. According to Terry Gilliam (qv)s commentary on  the Criterion Collection DVD, they had the shot set up perfectly  with the sun just rising, but when Johnny Depp (qv) tried to start  the car it was dead. They figured out soon enough that the driver  forgot to fill the tank. Due to budget and time constraints, the  shot had to be redone later that day.