Do we know for sure that these comments are not scripted?? There is no doubt that many of Paula's comments were planned for her, especially during the years when she and Simon were at each other's throats. It made for good TV.
Each of the judges on DWTS has notes in front of them -- Carrie Ann even TAKES notes -- but I'd love to get hold of their papers. My guess is there are plenty of "funnies" there for them to use.