Continuity mistake: When Cady is writing down Darius' name, the yellow post-it notepad is on the black desk pad. But in the next shot the post-it notepad is on her papers.
Continuity mistake: When Walt is at the Red Pony to talk to Henry, he drinks some beer and when he sets the can down there's a food basket to his left. But in the next shot the food basket is next to his right hand. It switches back and forth depending on the camera angle.
Visible crew/equipment: At the start of the episode when Vic wakes up Walt in his Bronco, a cameraman is reflected in the Bronco's right wing-mirror as Walt steps out of it.
Answer: Chance.