Continuity mistake: When the chariot race ends, Messala disappears from the track, only to reappear a shot later.
Continuity mistake: During the race, dolphin sculptures are tipped down to count the laps. Right after the third dolphin is lowered, there's a shot from below a horse and one can see that the dolphin is raised again. (02:46:55)
Revealing mistake: During the chariot race, when they're about to make a left turn around a corner, the people wave their arms. Right when they're making the turn, the arms move awkwardly fast, revealing the scene was speeded-up. (02:48:37)