First of all, the pressure from the administration surrounding PARCC can be overwhelming and deterring. I think proving to the administration that incorporating critical thinking skills will enhance the students test scores would be helpful for support.
I use different critical thinking puzzles, word games, and abstract problems in my English 9-12 class and my AP Psychology class. I have found that the students have so much fun getting involved with thinking that is "outside the box" of the curriculum. Their projects have also acquired a more creative freedom and risk taking attitude.
I think providing examples and lessons that teachers could use would be a first step. Followed by aiding them in creating their own critical thinking lessons. A school day would become more of a learning environment- where the classroom was a learning room.