US trip: observations about American English

I recently visited USA(California) and I want to share some observations about language
Just a reminder - I'm not a native speaker but grew up on American English, thanks to videos, forums, music and podcasts. Nevertheless I'm living in UK and as you can guess English here is a bit different.

During the trip I collected short list of different words which are common in American but not in British English:

in order: American, British
* leash, lead - I even didn't get it when read first time on sign
* riders, passengers - Seems like «rider» is more common is US, it's written everywhere
* bathroom/restroom, toilet - Oh, they don't understand toilet at all, it's very quite surprising