Apart from my first ownership that took me ages to work out what the side under-dash pull knobs did (every time I stopped and tried - nothing happened), that it doesn't rain in when the window is open, that at least one dash bulb falls out when you've checked them all and that every S30 has the body creases on the transmission tunnel in front of the tool-kit boxes........that every S30 has the threaded holes on the rear wheel-arches for race and/or rally works cages - thanks Count !
Nicest snippet is that on the whole, most Z owners are nice people and most of my best friends now !