An old car we owned that sticks out in my mind was my dad's '67 Riveria. He ordered it pretty well loaded, and it was the envy of the neighborhood when it arrived. One detail was that on the dash, the speedometer and some other gauges were aircraft-style rotating-cylinder displays. The cruise control was like a smaller version of the speedometer, with a knob to adjust the setting. You tuned it to the speed you wanted and it held that speed.
Sadly, the design was out ahead of the engineering. A lot of the accessories were vacuum-powered (GM seemed to be obsessed with using vacuum for everything back then) and the operation suffered from leaks and normal variations in engine vacuum. We quickly gave up on the power door locks because it was impossible to keep the vacuum hoses that ran through the door hinge from cracking. The car had hidden headlights, and the doors would sometimes refuse to open. When this happened, you had to stop the car, open the hood, and pull a lever to manually open the doors. The cruise control would spontaneously disengage when going up a hill due to loss of vacuum. (Where we lived, the cruise control wasn't all that useful anyway... once you got a few miles out of town, everything was two-lane roads.) Sometimes, when the air conditioner was on, the vacuum-operated air outlet dampers would fail to shift and it would blow all the cold air out of the heater outlet at the floor. And needless to say, all of this seriously perturbed the timing vacuum advance at times, causing loss of power and overheating.
The power windows had problematic regulators and sometimes a window would get stuck in transit. Like many GM cars of the period, it had wipers that swept in mirror-image fashion, and occasionally a drive cable would slip a bit and then the wipers would clash and the motor fuse blew. I remember this happening once when m mom was driving in a downpour. The power antenna also got tended to get stuck, and unfortunately it was wired such that it retracted every time the ignition was shut off, so just leaving it up was not an option. Sometimes the radio was unusable because the antenna wouldn't go up.
What did the car in, though, was problems with the distributor drive. This necessitated an engine teardown and rebuild to replace the camshaft, for which the car was in the shop nearly a month. After that, my dad sold it. It was only two years old at that point.