Okay, Clash of the Titans is a movie based on Greek mythology.
Of course it was going to be inaccurate.
Nonspoilers for the plot: it's the story of Perseus. Well, sorta. Perseus is raised by a fisherman, cuts off Medusa's head, and rescues Andromeda.
Tragically, they changed the details for all these events.
(
Ranting about the stuff they changed )