The Roman alphabet consists of capital letters only (no lower case). When Titus writes his letter to the emperor Tiberius he uses a lower case i (with a dot above it). Even the preceding Greek alphabet has the iota without a dot.
In the early scene in which Tito Valerio Tauro leaves Tiberius on the isle of Capri, the film is being run backwards because the fire and smoke on the upper right of the scene is going into the fire, not up and away from it .
Afraid of attempts to kill him, the emperor Tiberius didn't allow anyone (with the exception, of course, of his hand-picked bodyguards) to carry arms in his presence. Yet, Titus Valerius has his sword on his left hip when on Capri.