Continuity mistake: When Walt walks into the house at the start we can see the kitchen has a window and it's bright sunshine coming through. However, a few minutes later we see the kitchen behind Walt and it's in complete darkness despite the previously mentioned window. (00:04:50)
Continuity mistake: Just before Lucy finds Walt, the items she has gathered swap from her left arm to her right. (00:03:20)
Continuity mistake: When Jr. is walking out of Hollie's room with the freshly printed posters, the box is on the floor with the flap open by the leg of the table. When we see Jr. leaving from the box's POV, the box has rotated and the table leg can no longer be seen by the flap of the box. (00:14:20)
Continuity mistake: At the end of the last episode it's mentioned by Gonzo how heavy the meth is. However, in the same scene in this episode, it's omitted. (00:02:50)
A No-Rough-Stuff Type Deal - S1-E7
Continuity mistake: When Walt and Skyler are talking on the sofa, Walt's hand goes from Skyler's leg to her hands instantly. (00:40:20)
...and the Bag's in the River - S1-E3
Continuity mistake: The position of Walt's right foot changes when he collapses. When he first collapses his foot is pointing toes away from his left foot. We then see Krazy8 stand up and now Walt's right foot is pointing toes towards his left foot. (00:23:10)
...and the Bag's in the River - S1-E3
Continuity mistake: Walt writes a list with the title "let him live." The position, style and size of the writing changes from when he writes it to when we see the list with 2 entries on it. Note the T in "let" has moved off the margin line. (00:20:10)
Continuity mistake: When Krazy8 falls to the floor, his position on the floor changes between shots. Notice his right arm in relation to the curb. (00:13:20)
Chosen answer: It is part of the ritual for la Santa Muerte. It is a sign of humility and sacrifice.
djm