not an expert in ancient agro-botany but ... the fields shown - those rolling expanses of nothing but wheat - are a very modern thing and would certainly not have looked like that. Not in 180 AD and not in 1800.
without pesticides you have all sorts of things growing along with the wheat (some of which would be nice to look at like poppies and cornflowers and others just random weeds) and without mechanization you would have a much smaller-level segmentation of the landscape.
in the close up ... the actual type of wheat might also have looked morphologically different, a lot of what the Romans grew would have looked more like this
https://en.wikipedia.org/wiki/Farro. and then again in Italy itself wheat wasn't really mass-market produced for profit in large fields, during Imperial times ... most of that was imported. But I don't know where this scene is supposed to be set.
But well one can't really blame them for not recreating an entire ancient Roman agricultural lanscape ...