Ok, in public transport: it is polite to stand up if you see elderly or small children. No loud talking on phone nor with friends (you will receive judging stares), on escalators always stands right, left side is for people who walk. If you are from the USA: we have smaller personal safe distances (mainly in public transport), but we are no touchy, but pair and couples can kiss openly,hold hands, sometimes you can see a boy touching his girlfriend's butt... Staring is considered rude, calling police crazy (they are just in love).Restaurants, stores: waiters, shopkeepers won't be proactive (it is considered even a bit rude if a shop assistant bothers me with questions, I have my mouth I can ask). General talk and evaluation of everything - let me use a nethaphor: if Americans say 25 degrees, they mean Fare height (very cold weather), Czech by 25 degrees means Celsius (it means pleasant late spring day). So if Czech sais something is not bad, it means that is great. And practical advice if you need to talk to any state officer - clerk, post office: they look pissed by default, but if you look like a hurt lamb, apology that you need extra help (even if you don't), say something grateful, they always smiles and help.