When Novak is undercover with the counterfeiters, he claims he is going to trade the bogus notes with the Denver Mint. This place deals with coins, while it is the US Department of the Treasury's other institution, the Bureau of Engraving and Printing, located in D.C. and Forth Worth. Novak is not necessarily making an error - he is simply going along with the common misconception of people that it is the Mint that does all the money.