During the final battle between Antony's and Octavius's armies, Tyranus removes two silver emblems from his chest to denounce Antony and fight for Octavius. In the next shot, they are there again. Later, they disappear once more.
Unsheathing a sword from a leather scabbard will not produce a metallic sound.
Horses are shown saddled with stirrups. These were unknown in the empire and only introduced to Europe hundreds of years later.