Corrected entry: When the ship enters the Lair of the Sirens, Marina calls for Spike (the dog) to extend the the blades on the sides of the ship. But she's only been on board a day or so and has been locked in a store room. She cannot possibly know that the blades exist, let alone that the dog knows how to activate them.
Corrected entry: When Sinbad and his crew reach the stone gates, Eris sends a frosty blizzard to sweep them with snow and ice. By the next scene, all of them are cozily swaddled in parkas and furs. My nitpick is two-fold; first, why would they have all this winter gear with them? They're a Mediterranean sailing vessel, and would almost never have to deal with arctic conditions. They shouldn't even have all these parkas. Second, Marina is wearing a perfectly-tailored, form-fitting jacket. If she was a stowaway, why on earth were they carrying a parka that was just her size?