Here is an exit ticket that Annemarie Orth asks those who observe her classes to fill out. I love the idea of giving them a form to fill out, just as the students are sometimes required to do in the form of a self reflection ticket or a quiz. Annemarie is all about metacognition and this certainly fills the bill, holding observing teachers accountable for playing a part in the dialogue:
Annemarie shares:
There are only 4 questions. I wanted to keep it simple that way people would actually fill it out:
Orth-exit-ticket-for-observers