- 'Harris, Richard' was originally cast as Commodus. He withdrew because of artistic differences with the director. He was replaced by 'Plummer, Christopher'
- Sophia Loren's salary for the film was $1,000,000 becoming the second actress (behind 'Elizabeth Taylor' for Cleopatra (1963)) to receive that amount for a single film.
- At 1312 by 754 ft., the Roman Forum still holds the record as the largest outdoor set ever built for a film.
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