Yes, I saw and heard this. It confused me, and I'd wondered the same thing. It was either a blooper or the writers hadn't established the Flora Character on paper yet and had him call her Elizabeth. Which begs the question:
Does anyone have any idea how far in advance storyline concepts were drawn up and how far in advance to airing were scripts written? I would imagine the writers used general storyline concept to follow as a guide. Though as we've often seen, nothing is written in stone on DS. So much happened to force a change in plot direction; ratings, actors' sudden departures for other roles, vacations, tantrums, what have you...