What I think they've definitely got right is the Cat. Attempts to make him a bit more useful over the last few series made the character less characterful. In the current series he's almost as vain and self-absorbed as he was back in series 1, which is much to the benefit of all, I reckon.
If you were watching carefully, in the scene where Cat, Rimmer and Kryten are frantically typing at keyboards to deal with Pree the computer, Chris Barrie is trying very, very hard not to laugh at Danny John Jules' frantic facial expression. And failing quite a lot.