I think that the repeater lights are purely a French thing, I remember them when I first went to France in the 50's.
The other things that struck me were Citroen's, Simca's and Panhards, cars which you never saw in the UK (Although The Citroen was also assembled in Slough and the 2cv pick-up was supplied to the Royal Navy, but I don't recall seeing them).
Other than that, the system of taking a ticket from a machine at the bus stops instead of having to queue - now used in supermarkets and hospitals everywhere, avoiding a multitude of arguments!
Oh, yes, and a choice of flavours in ice cream cornets, we just had strawberry, chocolate and vanilla, and didn't catch up for years after!