Continuity mistake: When James McGill returns from the toilet, Craig Kettleman is rubbing his hands. In the next shot he is holding a cup with the right hand and his left hand is hidden under his right arm. (00:25:05)
Visible crew/equipment: At the end of the episode Saul is sitting in his office and you can see the shadow from a crew member in the windows. The member even moves. (00:50:41)
Other mistake: In episode 3 Jimmy says to Kim that the Kettlemans bought a boat using some of the money they embezzled. Nevertheless, when Mike breaks into the Kettleman's house and gets the money back which later is delivered to the district attorney in this episode, it's the whole amount without any money missing.
Answer: It might be the Panavision cap he wore when directing his terrible commercials.