During shooting of the scene where Hercules breaks free of his chains, Dwayne "The Rock" Johnson stated that he "blacked out" after every take, "I asked the prop department to lock me in with real steel chains that I couldn't break, so the performance would be real. When Hercules finally accepts his fate of being the son of Zeus, it's the epic moment of the mythology, and our movie. We shot this scene eight times. I blacked out every time. Down to my knees. Well worth the pain. This moment is iconic. I'm excited for you to see it."
When King Eurystheus (Joseph Fiennes) congratulates Hercules (Dwayne "The Rock" Johnson) for killing the Hydra, he is shown breeding peacocks. This is the sacred animal of the goddess Hera, Hercules' enemy, and foreshadows Eurystheus' true intentions.
Dwayne Johnson (Hercules) wore a false beard in this movie, made of yak testicle hair.
Tydeus (Aksel Hennie) was the father of the Greek hero Diomedes, a participant in the Trojan War, written about by Homer in "The Iliad".
According to Greek mythology, Autolycus (Rufus Sewell) is Odysseus' grandfather.