The child riding the scooter outside Lester's house is Ethan Lee, the son of actor/director Bryan Lee and actress/do Jasmine Lee.
The bar scene was filmed at local Kingman hangout Black Bridge Brewery. All the bar patrons whose backs face the camera were that of the other principal actors. The only person at the tables facing the camera was the real bartender.
Immediately following principal photography, the white van used as the getaway vehicle was sold, prompting the crew to figure out a solution. In order to get the few extra shots needed, clever editing and two different vans were used to get the required shots.
In the scene in Lester's house when Luke pistol whips him in the face, the actor playing Luke accidentally hit him for real. That is the take used in the film.
While shooting Lester's death, the camera malfunctioned. With minimal time and resources, the crew had to scramble to clean the area, re frame the shot and retry. The second take was used.