Patzer

In one shot, when Cobb puts the gloves in the young man's mouth it is half sticking out but in the next scene it is almost completely in the young man's mouth.

During the safe robbery, Bill is clearly shown wearing gloves, most noticeably when he pulls the paper with the combination from his pocket. However, as he starts to open the safe, the gloves are gone and they never reappear.

At the site of the safe robbery, when The Young Man drops his pants to tape the money to his legs, he's wearing striped underwear (which are also seen hanging on a clothesline during the confrontation between The Young Man and Cobb later in the film), but when he returns to his apartment and removes the money, he's wearing underwear with polka dots.

When Bill goes through The Blonde's things at his place, the clock he picks from the bag shows 12:44. Moments later, he picks The Blonde's photos and sets them against the same clock, which is now showing 12:36.