The rope that is tied around Sunshine's hands changes to another type of rope when Callan is untying her.
When Callan's dad gives him the cross before he dies; he comes in the room injured and has blood visible in the corner of his mouth. After cutting away and back the blood has now switched sides.
When Zyal is examining the captives' blood, he is using a extremely basic high school-level microscope and talking about seeing (visually) their genetic markers. Genetic markers would never be visible to the naked eye.
And, when going from one captive's blood to another, he doesn't even change slides; he just squirts new blood onto the slide in the microscope.