Long ago I have read somewhere a good method to prevent this:
When doing a proof of concept, always use ugly black-and-white buttons and icons. That makes it obvious even to the non-technical people that it is not finished yet, and still requires some work to do.
When doing a proof of concept, always use ugly black-and-white buttons and icons. That makes it obvious even to the non-technical people that it is not finished yet, and still requires some work to do.