Factual error: The Pretorian Guard was not as loyal to the end as shown in the movie. Actually, they were bribed into rebelling against Nero.

Quo Vadis (1951)
1 factual error - chronological order
Directed by: Mervyn LeRoy, Anthony Mann
Starring: Peter Ustinov, Deborah Kerr, Robert Taylor, Leo Genn
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.
Emperor Nero: Poppaea, one woman shouldn't judge another. She hasn't the glands for it. Ha-ha.
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