Other mistake: At the end of the episode, after Cook's father has been pushed off the boat, there should be only 4 people left on the boat (J, Freddie, Cook and Effie). However there is a camera man sitting behind Freddie inside the opening to the hull (you can see their arm/hand and camera lens).
Continuity mistake: When Emily and Katie are in their room, Katie is getting clothes at her closet and talking to Emily about going to the Love Ball. She says to Emily, "Please, I need you, OK?" Then James comes in and Katie, who is naked, hides herself with the clothes she has in her hand. First the two clothes hangers are black, then in the next shot one is black and the other is purple. (00:22:15)