When Hercules and Helen see the Hercules movie poster ("He doesn't even look like me!"), Hercules removes his sweater and flexes his muscles. You hear Helen say "Oh wow!" and gasp but her lip movement obviously shows she is saying more words.
When Hercules holds back the forklift truck after escaping the
ship with Pretzie, he says "A fine chariot, but where are your horses?" but he mouths the words too early and no audio is heard. This is corrected in the non-dubbed version with Schwarzenegger's real voice.
A mix of the Greek and the Roman names for Gods are used in the film.
In the films finale, both the Greek god Atlas (the only person holding the sky up over the earth) and Samson, who is in fact a Biblical character, to help Hercules are called upon
In the version of the film with Arnold's real voice restored, Hercules' replacement voice remains in the scene featuring Pretzie speaking with Hercules over the radio. The film studio has attempted to disguise this by adding radio static, but "Herc" still sounds completely different from Arnold.