Common mistakes include choosing stark white cabinets that create harsh contrast with brown tile floors and amplify green countertops. Another misstep is neglecting undertone clashes between flooring and cabinetry, which makes the kitchen appear chaotic. Ignoring hardware, backsplash, or lighting updates also diminishes overall cohesion. Avoid these errors by selecting warm neutrals and balancing undertones through layered updates that harmonize all kitchen elements.