Continuity mistake: When Shirley walks through the door you can see over Alan's shoulder that he's reading the comics in the daily paper. As they talk the paper changes to the business section.
Hired Guns - S1-E10
Continuity mistake: As Denny walks out of his office after shooting the assailant, Sally moves to the doorway, hands by her sides. Shot cuts to further away and her hand is suddenly up by her mouth. (00:32:40)