The scene in which Louie and Nick fight caused a minor controversy in December 2009. An extra on the set recorded audio of the scene during filming and posted it on the internet claiming that it was a real fight. The audio spread and many believed that it was real. Howard Stern played it on his radio show and also believed that it was real. C.K. and DiPaolo posted statements that the fight was a scene.
In the "Nick" segment, the man who plays the Comedy Cellar emcee is actually a waiter at the club. According to Louis C.K., he forgot to hire a comedian to play the part and the waiter was the only person available.
The man who tries to hold Nick back during the fight is played by Manny Siverio, the stunt coordinator. Siverio needed to be in the scene to help keep DiPaolo and C.K. safe.