When Cathy and Michael arrive at the villa, Cathy has a band-aid on her left arm between the elbow and the outer edge of her arm. This is seen when Michael knees her in the butt. When Cathy picks up the shower head and pretends it is a telephone the band-aid is missing. But when she walks outside with Michael, the band-aid reappears.
Just before Michael views Lina with his binoculars there is a puff of cigarette smoke that passes him. But scenes of Michael just prior and after shows nobody around him and no cigarette in the ash tray.
As "Kathy" arrives at "Lina"'s, Lina is reading outside, mostly in shade. Moments later, when Kathy walks through the same area, it's in direct sunshine. Moments further on, Lina is seated near Kathy, with both women mostly in shade.
When Cathy, wakes alone the first night in their villa, she awakes naked. She wraps a sheet around her, calling for Michael. A moment, later she finds him on the balcony, she is wearing both a bathrobe and a t-shirt.
When "Kathy" heads to "Lina"'s to confront her, we see a man sitting with a donkey to the right of the path, in the shade. As "Kathy" comes into view again momentarily (seconds later) the man & donkey are gone.