Audio problem: When Maximus is eating with Juba and Hagen, just before he fights Tigris of Gaul, listen to the background noise very closely as the men talk. There's lots of chatter and stray noises, but amid the sounds you can hear someone yelling urgently: "Warren, Warren... Warren...radio." This may be the sounds of a crew member telling another regarding a radio. (01:36:30)
Audio problem: When Proximo has lined up his slaves and says "And when you die, and die you shall. Your transition shall be to the sound of..." then he starts clapping. We hear the clapping and it cuts to Proximo clapping once then stops, but we can still hear one extra clap. (00:48:55)
Audio problem: When Commodus is talking with Lucilla before the Battle of Carthage as he is saying "I could announce the dissolution of the senate...". It cuts from behind him and he says "...are the people ready?", however his lips don't synch up with what he says. (01:32:25)
Audio problem: Before the first battle in the Colosseum there is a speech about Hannibal by Cassius. He says "Ferocious mercenaries and warriors from all brute nations bent on merciless destruction conquest." As he says "Conquest" it cuts to a closeup of the gladiators. Look at the crowd in the background. They are getting up while cheering and clapping. However you can't hear anything else than the speech. (01:20:05)
Audio problem: When Commodus and Gracchus are having their little debate in front of the senate and Gracchus says "Then perhaps Caesar will be so good as to teach us, out of his own extensive experience.". Then it cuts to a wide shot of the senate, and you can hear them laugh. However, none of them are moving their mouths, nor seems amused in any way. (00:59:15)
Audio problem: When they get in the gates at Proximo's after he has bought the slaves you hear him say, "I am Proximo" but his lips aren't moving when he says it. (00:48:20)
Chosen answer: No, they are full brother and sister. They both had the same mother and father. Incest was not exactly normal at that time, but it stretches back within the imperial families as far as Caligula and possibly earlier. There is no evidence to suggest that the real Commodus was attracted to his sister, it was probably just included in the film in order to make the character seem more disturbed, and also as another reason why he would be Maximus' enemy (Maximus and Lucilla were, after all, once lovers).
The Doctor