Another Canadian.
All-green money is weird, about as weird for us as ours is for you. Once I knocked over some products in a store and then picked them up. The staff acted like that was saintly, so I guess other people just make a mess and move on? Drive through liquor stores are weird, and seem like an invitation to drink and drive. Paying at a hospital is weird just in concept, although thank god I've never had to deal with it down there.
Uhh, other than that it's been pretty similar in the places I've been. Etiquette around "sorry" is famously different, but aside from giving me away as Canadian it has little impact.
Edit, to add a couple positive things: Amazing Mexican food and barbecue not only exists but are ubiquitous. Coding jobs pay good money.
Everyone has an air conditioner, although Canada might be the weird one there.