Here's another potential cause of a rattle in the door when the window is up: There's a plastic adjuster that rides in the window regulator track, and it stops against a metal tab. (See photo for these two points, circled in red.)
When the two parts meet, it can cause a rattle. I fixed my rattle by simply adding a small rubber pad on that metal tab, where the plastic adjuster meets it. Super easy fix (once you pull off the door panel and then remove the regulator!)
Steve
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