Play every frames in the animation pref's, you need it to this as dynamic sims (cloth, rigids, particles etc) are finite and need to know ehat the previous state was before evaluating the next frame.

To change between max realtime and free, right click over your time line, it should be there.

As for another vid, well I suppose it all depends on how long you want each vid to be.

I keep thinking of doing a vid tut, what capture software do you use?