Pythagoras' tale of the maenads being able to draw milk and honey from rivers refers to stories of them performing miracles, such as drawing milk from the ground using their nails and having thyrsus (sacred staves) from which dripped honey.
Satyrs, here depicted as savage ape-like creatures who serve the maenads, were fertility spirits often seen drinking, dancing and playing music with Dionysus. They were animal-like men who had horse tails and assine ears. The goat-legged, horned satyrs that are most commonly known today were called Panes.
Medusa did indeed begin her existence as a mortal.
Hercules (Mark Addy) remarks as they are entering the forest that they could fake their deaths so as not have to return to Atlantis. He said "We can grow beards. Big beards." As Robert Baratheon in Game Of Thrones, Mark Addy did just that.