Character mistake: When Hank is brought to the hospital with gunshot wounds, the ambulance and its two EMTs are met outside by two doctors. One doctor says "Let's get him two grams of oxygen. What's his hemoglobin?" This episode's technical adviser was perhaps away for this scene. How much exactly is two grams of oxygen? Orders for administering oxygen would be given in liters, such as two liters per minute (LPM). The line is presumably meant to be 'two liters of oxygen'. (00:02:25)
One Minute - S3-E7
Character mistake: When Hank is asked to hand over his gun and badge, he just puts his loaded gun on the table. When, in fact, you would remove the magazine and bullet in the chamber before handing it over.
Character mistake: After Walt tries to slap the fly on the paper, he lifts his hand and the math is wrong. He has 2,103 + 9,745 = 11,928 and 6,012 + 7,287 = 13,301. But the actual sums are 11,848 and 13,299.
Chosen answer: It is part of the ritual for la Santa Muerte. It is a sign of humility and sacrifice.
djm