Common mistakes with khaki paint colors include choosing shades that appear muddy or lifeless, pairing them with clashing undertones, or ignoring lighting effects. To fix these, always sample khaki paint in your specific lighting, pair it with complementary materials like crisp whites and warm woods, and avoid overusing dark or cool accents. Balancing the palette with the 60-30-10 rule ensures khaki colors feel fresh and grounded rather than dull or drab.