When talking to Joan, Louis refers to Internal Revenue Code (IRC) Section 14.2. There is no such section in the IRC. The code numbers jump from 12 to 15.
The coffee truck outside of the lawyers office says "100% Columbian Coffee." It should be spelled "Colombian."
When Harvey and Mike confront Garrett Brady at the falafel truck, you can see that the truck is from Paramount Middle Eastern Cuisine, a Toronto-area chain with no presence in NYC.