1. Cant reall tell but it looks like a horn... Or maybe if u have auto lights, maybe the sensor for that.
2. Sometimes its a pain to get the plastic door thing to stay in place and sometimes even stick. I know ive ripped my fair share of them out. And idk about that whole but looks like u just need to put the door panel back on before you find more unusually things about your car, lmao. Take care!!