Wow this is fantastic! There's nothing I can add to what the other reviewers said: excellent acting, excellent mixing (although the narrator is definitely louder on the right). The only things I'd change are script things. Like, I would have ended the "real names" bit at "I'm not Jeff, I'm Paul!" There's not really any humor in having Paul acknowledge the mistake later on.
What really matters, though, is that this is certainly among the very best examples of voice acting work on Newgrounds. Well done.