I would also add the reasons for some of the rules. Its not enough to know you have to have 7 guys on the line - why is that? Why is it important to know when I'm supposed to be on the line and when I'm supposed to be in backfield.
Also - the federation has a nice handout for captains, this captures a lot of the important rules (go to the national federation football page and download it).
A few other little-known rules:
PAT kick is dead if blocked (offense can't pick it up and run it in).
Rules on free kicks after a safety.
Motion rules (have to wait until everyone is set, QB going under center is a shift,etc).
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