DOOR PROBLEM? back problem?, mionr adjustments need?? Options

[chacha]

Whenever i close either the driver or passenger doors...i hear a sound that makes the door seem as if it is kinda hollow inside...gets me kinda paranoid that i think the door is hollow...is this normal?? i want a clean solid sound as i slowly close the door...anybody with the same effect? Also how about the rattling noise where the lights shine on the license plate...where the bulbs are....[b}] i try tightening it [/b]...but nothing seems to work...as i start car...walking around the car to the back trunk, i heard a noise from where the bulbs caps ontop of the license plate rattle...it's not license plate that's rattling but the caps protecting the 194 bulbs are wiggling and thus making the noise. any help?