Continuity mistake: When Walter takes Junior home from school, at first there are no shadows or sun hitting the ground in front of the garage. In the next shot the sun appears.
Visible crew/equipment: In the scene after Walter took his son from the school and parks his car in front of their house (before the pizza scene), you can see the camera mounted on a crane while filming the scene reflected on the car's windscreen.
Continuity mistake: When the two guys grab the Ouija board, the 2 games that were on top of the Ouija board disappear instantly. (00:22:30)
Answer: Saul is a criminal himself. It's not past his capabilities to forge some documents to show the 857k is available.
Ssiscool ★
Forged documents by Saul is most likely the correct answer.
The_Iceman