 Where Becky returns home, the fact that Becky was played by a  different actor was actually joked about in the show. Roseanne says  makes a comment that when she came back she barely recognized her.  At the end, the Connors are watching an old episode of  _"Bewitched" (1964)_ (qv) and discussing switching Darrens, when  Jackie says something like, "Well, they were a hit show, they could  get away with anything". The new Becky says, "Well, I like the  second Darren much better". (self