Other mistake: If the cartel's money to be cleaned is from selling drugs then why is it all brand spanking new? In season one he gets it delivered in a van in boxes. When they open them the money is new bills, still in bank wrappers. Why would people buying drugs go to the trouble to going to the bank to get new bills?
Continuity mistake: Roy and Scotty pull up in their truck just as Roy's mom Barb is carrying a coffee table down concrete stairs from a house (not sure if it's Barb's house). After Roy and Scotty load it in their truck and ready to drive off, Barb asks them to "hang on" for a minute. Barb appears to jog a few paces on the sidewalk before running up the concrete stairs. When she reaches step five or six, she collapses. The next scene shows Roy racing to help Barb, but now she's on the sidewalk just starting step one. (00:20:10)