Please forgive me if this has been mentioned before, but my car is new to me and 594 posts is a lot to go through...
But I recently noticed a behavior that I hadn't heard about or read about in the owners manual. When the power is completely switched off, the illumination of the lamp controls will stay lit for some amount of time. (Maybe under all conditions, but at least at night when it's dark enough to notice.) I assume that this is so you can easily find the lamp controls in the dark in order to turn them on if you need to. The next morning I noticed the illumination was extinguished, I assume in order to preserve battery charge.
Not anything cool that one can DO with the car, but a nice little, helpful feature.