Right out of the gate, this app note has the classic Jim Williams style, with five oscilloscope photos, with three or four traces each. His application notes can often be identified just by glancing at them because they include scope photos showing real data taken with vintage Tektronix gear. You can see the round bezel in several of the photos, so I'm guessing that the instrument was his favored Tektronix 547 with a 1A4 four-channel plugin.
This app note includes eight pages of tricks using the (now-discontinued) LT1005, a dual-output regulator with a main-output-enable pin. Several input protection schemes are implemented using this enable pin (the clever positive feedback latch, shown in Figure 2C on page AN1-2, is the basis for several variations). I think the best circuit here is actually the 100-pF speed-up capacitor in Figure 3 to get the base charge into Q2. I have a soft spot in my heart for circuit tricks from the days of RTL (resistor-transistor logic, you know, the Apollo technology).
The final two pages explore using negative feedback around the regulator to implement closed-loop control. Hysteresis-loop-based motor-speed controllers are shown on pages AN1-7 and 8. I've always viewed some of his feedback contraptions (like these two) with suspicion. His design approach to feedback loops was always a little too cavalier for my tastes, especially since good models for voltage regulators (particularly good transfer-function models) are hard to come by. I'm pretty sure that the phase margin of these loops has never been determined (as a control-systems aficionado, I prefer a more analytical approach).
He seems to have a never-ending supply of interesting, random, and often hard-to-find hardware for his application circuits. In the various circuits, this note specifies a thermoswitch, a thermistor, a crystal-oscillator oven, and two different motor/tachometer units. Although he gives part numbers, it is sometimes difficult to independently source these parts to duplicate his results. I've had trouble finding his components in the past. Sometimes substitutions are easily found, sometimes not. Some quick online searches show that only one of the specified parts in this app note is still easily sourced (the thermoswitch). Often, the only result returned for an online search for the part numbers is just the same application note.
I wonder: was the primary source of these parts from customers looking specific application assistance, or from his personal junk pile? (That said, I actually have some of the little Canon motor/tach units in my personal junk pile, and I love them for small experiments and lab projects.)
Best quote (page AN1-7): "For example, the small motor listed... is almost unstoppable by the unaided human hand at 150RPM." I imagine a group of engineers gathered around the lab bench, nursing friction burns on their fingers after failing to stop the motor.