3POs lines more  audible, and some of Leias lines less so. In the original, the noise of the  carbon freezing chamber makes it difficult to hear his line to Chewbacca, "So  dont do anything foolish." This was not a new line added to the Special  Edition, but a line made more audible over the noise of the machines. Later  in the film, when Chewbacca chokes Lando, Leia says, "You think that after  what you did to Han that were going to trust you?" In the Special Edition,  Chewbaccas growl is so loud that part of her line is obscured.