In the scenes at the beginning where Willy Jack is in the car his shirt changes 3 times before he's finally pulled over with the 14 year old girl. It's all one day.
When Novalee (played by Natalie Portman) is running out of the Wal-Mart after realizing that Willy Jack has left her, there is a poster above the door from Star Wars Episode 1. The poster is Natalie Portman as Queen Amidala. These posters were supposed to have been removed during filming.