Can anything be done to deter rattles

[DavieGravy]

Even with the slightest bump, crap everwhere rattles. When accelerating hard, the force causes the dash creak. It doensn't come from one spot, rather everywhere (dash, seats, doors, etc) The hard suspension doesn't help.
Can things be tightened up? Is there some means to fix this?
Someone mentioned earlier that the rear deck and door locks are prone, but I don't think those are an issue in my case.