1.) trash bag is considered a reasonable substitute for the original clear plastic rain/moisture barrier (many mechanics and body men don't even bother, but it's nice to have.)
2.) Assuming thats gold colored aluminum, those clips are for the flat semi padded door panel insert to attach it to the larger door panel. If yours are all ther these must be extras from previous work/panel. If they are white plastic they look like the seat back spring aligners against the horsehair seatback pad; what those would be doing in a door is beyond me.(jerry rigged clip replacement?)

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)