yes, I have the same problems. It seems like everything is creaking and makign noises inside anymore, even after I have checked everything for proper fit.
honestly, you will drive yourself insane trying to fix squeaks and rattles, i know i have, they just keep appearing, more everyday, and i don't know why. my only answer is to maybe get some felt tape or 3M Squeak tape and apply it where the squeak seems to be coming from, although even that doesn't always help.
Interior quality on this vehicle is not the greatest, as i have found. Good luck to you though!
1998 PONTIAC BONNEVILLE SE, 182K mi