Difference between film and mythology

2010 film

 * Io is an ancestor of Perseus rather than his love interest.
 * Agenor and Perseus are cousins in myths, but they also never met and Agenor was also a distant uncle of Perseus'.
 * In the movie, Perseus rejects Andromeda's offer to staying in Argos and instead leaves her to be Queen of Argos while they married in the myths.
 * However, in the alternate ending, Perseus and Andromeda end up together rather than Io and Perseus at the end.
 * Andromeda and Perseus end up in a relationship together in Wrath of the Titans.
 * In Clash of the Titans, Hades is shown to have despised Zeus for being tricked to rule the Underworld in sadness and in misery. However, in Greek Mythology, Hades takes his job very seriously, and even very stern and intolerant.
 * Is not necessarily evil just like Clash of the Titans.