I bought the car new in 1976, and the electrical components kept the car in the shop over and over for the first 6 months -- first instance, all interior lights went out.
Loose lug nuts when delivered to me by the dealer.
Grinding transmission when down-shifting to 1st gear (no solution ever found.)
Trailing arm shackles loose, needed securing.
Misaligned driver's side door (always leaked no matter how many times it was re-hung and adjusted.)
Headlight switched wired in backward -- "up" meant "down" and vice versa.
Brake lights and turn signals replaced (all this is within the first month or two, on a new car.)
Factory shipping plug in trunk not removed for delivery -- trunk filled up with water from rain!
A year or two later, began going through RH front wheel bearings -- replaced several times, then suddenly the problem stopped and never happened again.
Oil level "idiot light" had a pressure sensor whose diaphragm ruptured, dumping all the engine oil onto the road.