Screen color changes on MacBook

This is not necessarily a problem. Every flat screen I've ever seen does this to one degree or another. All these type of screens have an "optimum viewing" arc ... say 30 degrees. Move outside that arc and colors get distorted. Some are smaller than others.

There is a cable for the lcd that goes by the hinge assemble, but usually when thats bad you get flickering. Could be due to whatever lighting you have in the room.

If your Mac display doesn’t look right - Apple Support