Last of a Breed: Part 1 - S6-E6
Continuity mistake: During the shoot out, where the family got shot. The boy fell down face first and is still like that when Walker came to check him. Shown at another angle, he's lying face up. Showing the boy again, he's face down again.
Character mistake: In this episode, the word 'development' is spelled wrong on the construction site sign (they spelled it 'developement').
Continuity mistake: Alfi refers to her father as a High Steel worker, yet a short time later when talking to her Mom, she says he was a concrete worker. He was killed in a concrete accident.