The black plugs are the "alien eyes" aka interior sensor trim covers. Porsche P/N 996-618-212-02.
You can get them new from just about anyone: Pelican, ECS Tuning, even eBay, for less than $10. Woody may have some used ones. Search for forum member "itsnotanova" on this forum.
As for the rear window vinyl, I've never heard about painters tape having a chemical reaction with the vinyl. Are you sure it's not just tape residue? Have you tried removing it with some WD-40?
Just wonderin'..........
TO
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