Continuity mistake: When Lucius asks the doctor to give him the prison keys and send a message to the soldiers at Ostia, Lucius' arm is bent around the prison bars, except for a brief shot where it's suddenly straight; then the shot changes and it's bent again.
Continuity mistake: When Lucius addresses both armies at the city entry, he throws his sword on the floor ahead of him. He walks around, and from the opposite front angle, one can see the sword behind him. From the immediate opposite angle of his back, the sword is gone.
Continuity mistake: After Lucius quotes Virgil, he kills a man who collapses on a chair. When he lies dead, there's a leg or armrest on the floor parallel to his body. A shot later, it's perpendicular.
Continuity mistake: When Lucius steps in the water to see his wife's corpse, his hairstyle around the forehead changes between shots before he is splashed by water.
Continuity mistake: During the riots night in Rome, Macrinus and Caracalla talk to Geta, his monkey on his shoulder. The position of the monkey is inconsistent in every single shot.
Factual error: Caracalla and Geta in this movie are decadent mad kings, but that's a portrayal that has no foundation in history - here they look more like their successor Eliogabalus. Caracalla in particular, who was the elder brother, wasn't an effeminate sybarite plagued with syphilis; on the contrary, even by his detractors, he was mostly remembered for being, or at least acting, very soldier-like; "Caracalla" was his nickname, after a military mantle.
Factual error: Much like its predecessor, this movie sorta speedruns through emperors; Geta and Caracalla here are shown as both ruling Rome as "twin emperors" in 200 AD, and die within a couple of days of each other, betrayed by Macrinus, who dies the same day. None of that is anywhere close to how things happened, to the point that discussing dates is sorta pointless; nothing resembles history if not in the loosest sense. Macrinus in this movie is never even formally proclaimed emperor, as opposed to him ruling for at least a full year.
