Occasionally, i see things and think now that's a cultural difference that would cause a north american a double take. Seeing cars parked facing either direction on a street. That's a weird one (yes in north america cars are parked facing one way only - no just sliding over to the other side of the street and pulling up onto a curb and parking. You turn your vehicle around and parallel park the sucker into the spot).
Then there's power outlets with individual switches on them. Or windows with little wind powered fans. Or the making of tea in a cup rather than a pot, or the fact that instant coffee is on many restaurants' menus.
But one thing that constantly surprises me is the pervasiveness even in "new builds" of individual hot and cold water taps. It's not that "mixer" taps (hot and cold going into one pipe) are unknown, but that anyone would want a single tap per temperature in either a bathroom or kitchen sink, or even a bathtub is beyond me. And it's not like they're cheaper: the price of two individual the taps is either the same or more as their integrated cousins.
It's a mystery.