Continuity mistake: The stock footage of the airplane that Don, Sloan and Elliot are on is of a Boeing 747, a very large widebody plane. However, the internal shots of the plane suggest that it is actually a much smaller narrow body plane. (00:13:55)
Plot hole: Will is telling Mac that the DOJ is being out-lawyered by a group of financial institutions, including Lehman and Countrywide, both of whom went out of business in 2008, well before the date of this episode on New Year's Eve 2011.