Factual error: When Luke is playing video games in the camp he is using a Playstation controller, however when he pauses the game it shows a message telling him to push the 'B' button. 'B' buttons appear on Xbox games consoles rather than Playstations.
Factual error: The Athena Parthenos is a bad copy, she should hold a smaller statue of Nikè in her right hand, but she holds her spear.
Answer: Water creature? The Hydra is a MYTHOLOGICAL creature, with many different variations in different stories. She lived in a swamp, had bad breath. This is just another different interpretation of the same Greek myth.
GalahadFairlight