The second chapter we have some breakfalling, resuscitation techniques, pivoting, small circle wrist stretching, and entry exercises for chokes and locks. Good stuff, but real basic. You've probably seen all this before. The only one I hadn't seen was where Jay shows how to press your thumbnail into the cuticle of the enemy's big toe. One oddity of the book is that there is very little of these strikes integrated with the locks and throws demonstrated later on.
Chapter Four starts off with some wristlocks and wrist trap come-along holds.
All very basic but with stuff like this getting fancy is not better. As the uke is reaching for Jay he locks the wrist with just one hand. More realistic demonstrations of wristlocks I have seen involve grabbing the wrist with one hand and putting the lock on with the other. A good techniques, IMHO, would be like the Underhand Wrist Lock on p. 84-85 where two hands are used to control one. Next are some finger locks.