This is one I hadn't seen in a LONG time, until seeing all the remastered DVDs recently. I was looking forward to it. I wonder if even remastered ep's are cut shorter than the original 51 minutes, because it went by so fast, with so little there. This has to be a cost-cutting episode. It was at the end of the season... What do we see of this Roman world? A cramped TV studio, a couple rooms, stock footage? I had no sense of any of it being real. I saw the "Roman" TV studio and could not help seeing it as what it was, a 1968 TV studio. And of course, they'd done duplicate Earths to death.
I don't see it as a cost cutting episode. They went on location for the outdoor scene. They made or bought footage of real neoclassical buildings. They hired three good actors as guest stars, to play the proconsul, Merik, and Septimus. Yes, the indoor sets probably didn't cost much, but it did take time time to get the Roman stuff out of storage and decorate the sets.
Kirk, sleeping with a slave, really? Not exactly consent there.