The position of Syrene's legs changes between when she is dragged up on the river bank and when Nereus goes up to put a cover on her. When she's dragged up from the water, both knees are bent, but in the close up, her right leg is straight.
As the Atlantean procession is walking into the ocean at the end of the movie, a few of the extras are breaking formation and character to fiddle with their fake eyes and talk to each other after a wave catches them off guard.