 The season two premiere was supposed to be the episode Re:Union.  However, the episode would not have involved John, DArgo or Aeryn,  and it was determined that people would not want to wait another  week to find out what happened to those characters. So the second  episode, "Mind the Baby", was aired first and "Re:Union" was  retitled "Dream a little Dream" and also had bookend sequences made  so the episode became a flashback.