#4: Most things are written in French with an English translation beside or below. But massive warning signs that let you know you can't park/walk/be here are often in French alone. Which makes me think I should learn certain things soon, like "beware!" or "watch out!" or "trespassers will be shot!".
I've also noticed that when the metro stops or is held up, the announcement is only in French. I wear a sort of bewildered look on my face much of the time.