Spanish is the primary language in Chile, but many businesses advertise using English words for certain common things. Terms like "Sale" and "20% Off" are common here, just like they were in Buenos Aires, Argentina.
Some English words like sorry are also part of the normal vocabulary here. In fact, Chileans only use lo siento (the way many Spanish-speakers in other countries say "sorry") in really serious situations, like when someone has died!
Chilean pesos exist as both paper bills and coins, just like in the United States. Chilean bills are different colors, but they are also different sizes, which makes them easier to tell apart for people who are blind or visually impaired. Many countries do this with their money, although the United States isn't one of them...yet!
A bottle of water in the city costs 800 pesos (about $1.20 U.S.) from a vending machine, and possibly a bit less if you buy it in a store. I've been drinking a lot of tea lately because of the cold weather!
