Roben,
I've taught a few classes and always put in little reminders, e.g. make sure you are sewing a 1/4 inch seam (I've been going towards a scant 1/4 inch lately.); Watch how they are pressing their seams, not ironing them, etc. Sometimes just reinforcing the basics helps out a lot. My biggest thing is telling them to make sure their rotary cutters are closed!!!!!!!!!!!!!!! I tell them I never want to hear about someone who's grandchild picked up an open cutter and severed the tendons in the palms of their hands. They all grimace and the blades are covered.
One thing I have done in my last two classes was to have the students set up, tables in the form of a "U" and then I have them bring their chairs into the open area and have them introduce themselves and then give them a little lecture about what we will be doing that day(that way they know if they are in the right class...you'd be surprised). Use props to explain the steps. Keep walking around to see what the students are doing. Give them time parameters..."It's 11:00 and so if you want to go get something for lunch at 11:30 you have a half hour."
I like the idea of the students bringing a camera to help them later. I also give them my home phone number in case they have any questions at a later time. (Most of my students belong to my guild and already have it, but it doesn't hurt.)
Good luck in your class and let us know how things went.
Chris