The writers chose to use modern terms of measurement throughout the series. However, the dialogue inconsistently switches between the use of feet and meters. In fact, at one point Silva declares that three meters of ramp had been completed in a single day. In the very next scene he says that 27 feet have been completed.
Sheva writes a message to the Jews. She writes in Hebrew but upside down, revealing that she doesn't really know the language. A minute later, Eleazar ben Yair holds the paper upside down, as well. Nevertheless, it is really written "at midnight" as claimed by Sheva.
In the beginning of the episode, Sheva writes a short message in Hebrew, but she writes it upside down.
In a scene in the roman camp, a modern rice cooker is obviously visible in the background of one of the legionnaire's tents.