Surely one would notice this during a test drive... why would you buy one and then complain about it?

I think the comment is very helpful.

Maybe he made a mistake and kindly warning you not to do it.

Not all the road noises and stuff can be captured during a test drive. The road around that dealership may be a perfect asphalt, but you notice things wrong later.

I also agree that the writer's comments are helpful and that not all possible issues may be detected during a single test drive.

Regarding the suggestion to "place carpet mats in the doors" and other areas to deaden noise, a more practical solution would be to have the bottom of the vehicle undercoated. In snow climates, this is done to prevent rust however a nice side effect is that it quiets road noise. If you are in a snow area, car dealers can do this. If you are in an non-snow area, you can buy the material (POR-15 from various sources and E.R.F. from JC Whitney are example brands) and you can have a body shop steam clean your underbody and apply the coating. Your Pacifica will be quieter.

My 2005 Pacifica AWD Touring has 33,000 miles and is tight as a drum and very quiet on the road. If I ever hear a rattle, it is the coffee cup loose in the holder or something. This car is very high quality and excellent fit and finish for it's price. Buy one.

I have a 2005 Pacifica Touring with 86,000 miles and absolutely no squeaks or rattles... tight as a drum. I can't believe they quit making this vehicle. It is a budget Mercedes.