Quo Vadis (1951)

Continuity mistake: When the giant is fighting the bull, in the long shots the bulls horns are white, but in the closeups, they're black.

Dennis Gannon

Revealing mistake: When the Christians are being fed to the lions, we can see that when a lion "attacks" one of the men, the man is actually smiling and visibly playing with that wild animal.

Other mistake: When one of the Christians is being crucified and burnt, we can see that just after the man's "death" the body is substituted by a plastic doll covered in red paint.

Trivia: Galva, the general who claims the emperor's throne after Nero's death, didn't last long as an emperor himself: just four months later, he was murdered by his Pretorian Guardsmen.

Emperor Nero: Is it possible that human beings can produce such a sound?
Petronius: Yes, when they've been pushed too far.

Emperor Nero: Poppaea, one woman shouldn't judge another. She hasn't the glands for it. Ha-ha.

Petronius: It is not enough to live well. One must die well.