This is a really simple idea to do at the beginning of a course. I heard this idea at a teaching workshop at Pitt. In order to ensure that students read the syllabus and understand what is expected of them--have a syllabus quiz.
The quiz doesn't have to be anything big; it's just to have students open up the syllabus, read it, and ask questions about what they don't understand. It helps get all students on board and avoids lots of questions down the road. It also gives you, the teacher, feedback on what might not be so clear or what needs improvement. Any student who spots an error gets extra credit.