The roughneck who gets rejected for a job is at the head of the line. After he gets rejected, he turns away -- and in the very next shot, which encompasses the entire line (and a considerable distance beyond) he has disappeared completely.
The poster that Alex stows in his drawer shows Kimble's name as "Richard Kimble." Later, Alex addresses Dexter as "Dr. Kimble." The camera doesn't show the entire poster, so it is not evident that Alex should know that Kimble is a doctor.
At the start of Act 4 Kimble (the start of this scene is outside) walks to the trailer serving as the construction company's office. As he does so he casts three different shadows, all in spite of the fact that this planet only has one Sun.
Though the setting of this episode is Nebraska, there are mountains (just like the set's in California, the filming location of this episode) in the background.