When the reporters receive the video text, the order of the audio is swapped. Dufort states that he kept the emails and phone calls before Jenkins says that he helped smuggle the money through customs. The recording plays them in reverse order.
Nathan states that the US has about $500 cash per US citizen in circulation. That estimate was wrong by a factor of at least five when this episode was released. In 2008, the US Treasury had just over US$821,000,000,000 (US$821 billion) in bills in circulation, which works out to roughly $2,500 per US citizen.
When Nate and the client are watching the video in the beginning you see the video rewind and here the sound of a tape rewinding like a VHS but when you see them watching it is on a laptop.
At the end, Nate gets in a red Porsche, as he drives away the car is now a Tesla.