Stupidity: Billy gave Skylar (a stranger at the diner who did a "dine and dash", not paying $12 for her food) a ride. She came across as suspicious, angry and "street smart." Billy nevertheless put his envelope containing $500 cash between the driver's and front passenger's seat where Skylar could see - and take - it. When they arrived at the Kite Skating site, Billy got out of his Jeep without even thinking about the money. (Skylar gave the money back, but it could have been kept). (00:19:19 - 00:20:35)
Continuity mistake: When Billy is walking (from his front porch) to his Jeep, the ground is brown, and he has to take several steps to reach the cargo area. When the camera shifts to a front view of Billy by the driver's side door, and he says, "Hi, coach", the Jeep is parked too close to the house for Billy to have taken that many steps to reach it and the grass behind the Jeep is green (not brown). (00:07:45)