My wagon has some rattles coming from the rear passenger area. Turned out to be the rear seat belt adjustes on the b-pillar. I just moved them down a notch and noise is gone. For the whistle from the drivers mirror when your window is down I used a small piece of velcro (fuzzy portion) in the leading edge of the mirror seam. Whistle is gone. Creaking passenger seat when someone is in it I have yet to figure out. Screeching window glass as it goes up and down is caused by some debri in the rubber next to the mirror. Take your finger or a cloth and wipe it clean. The screech will come back within days which is too bad.
Greg D.