Probably already mentioned, but 2cvs have strange mechanics. No head gaskets, inertial dampers on early cars, horizontal suspension springs under the car which required linseed oil for lubrication, points behind the cooling fan (fan has to come off for access), inboard front drums (discs on later models)... It all worked remarkably well in a very French way.
It's really weird, but having grown up with Cits from when they still were, I've found nasty stuff in regular cars regular mechanics wouldn't dare dis. Talking 1998 (or is it 1986?) and before, I can think of Fiestas and other Fords, many Renaults, Peugeot engines (yeuch!), various Mercedes nasties and much else which was pure unpleasantness.
A 2cv is logic itself and engineered to the highest standards within the economics of it all - way beyond almost all other automotive stuff; if it was cheaply built did that really matter, before PSA reduced material qualities so critically through the mid-late 80s? (the French knew this and had altogether stopped buying it beyond 1985).
This logic of the little Citroën is nearly matched with the insanity of its values today, especially given the low quality rebuilds most have received, partly due to the substandard nature of the parts now available. People really do lose their heads, perhaps understandably when the original product could be so beguiling - especially when the steering wheel was on the left.