Even well-shot green screen footage often has minor issues that need fixing in post-production. This lesson covers techniques like spill suppression (removing green reflection from edges), edge feathering (softening harsh cutout edges for a more natural blend), and using garbage mattes (rough masks to exclude unwanted areas like light stands or uneven lighting) before applying the main key. It also covers matching the lighting and color tone of your subject to the new background, which is often what makes a composite look believable or fake.