Somebody once plowed into the back of my SHO while it was parked. Left a nasty dent in the rear bumper. After having it repaired, the trunk no longer looked like it was positioned properly. The chrome beneath the rear lamps no longer lined up, and it appeared like there was a bit of a gap between the trunk lamp and the main body lamp.
I brought this up to the repair shop, and they told me Ford uses cheap plastic and that everything simply snaps into place. If it's sagging a bit, then that's just because it's not fitting back on properly, they said.
It's so minor, that no one who isn't a Taurus buff would notice. But I see it clearly, and it drives me insane. My new car can't come soon enough....