The simplest way to manage scope creep on a project is to identify the issues and address them with sincerity.  You can either increase the scope inclusive of the time and costs or negotiate on deliverables to meet the original project terms.

As a professional problem solver I've learned if it's too complicated, it's wrong. The temptation is to solve complexity with complexity, when in actuality breaking the problem down into it's simplest form generates the clarity needed to bring about the best solution or result. 

~Esther Scanlan, Manager-Business Advisory Services, Burr Pilger Mayer, Inc.