Revealing mistake: Al Pacino talks to the older man named Ron in a club filled with mirrors. If you look at Al Pacino's lips when "Ron" is speaking you can see Al coaching the actor playing Ron on his lines.
Revealing mistake: In the last scene of the movie after Carlito gets shot by Benny Blanco and Carlito's friend says "Let's get out of here", Benny Blanco turns and shoots him too. Right before he shoots him though, you can see Carlito's friend's eyes close and put on a facial expression as if bracing for the shot.