Great video!  The version of Hiki Nage I'm most familiar with is the one at 3:52.  Considering these are the old school versions, what are the major differences between these and the current, standard waza?

I find this technique fascinating, but have a question about the finish.  Is Uke's forearm flat against the mat, or is the wrist propped against the knee?  I think I'm seeing both, but would like to make sure.  Thank you!