It's probably the camera man.
High speed tiny particles hitting at an angle almost parallel would not rip open the craft exterior skin but bounce off with an impact sound like a thud against metal so I'm guessing mass just above dust size would make that sound.
Didn't think to knock back.
I doubt that it was a regular 1-2 knock like they portray it. It was probably random single knocks which would be easier to explain by natural causes.
Don't ask me where I got that material, but here it is, it's "eyes only" https://pic8.co/sh/ge38KW.png
Nothing of any significance. Next?
You're blind
Janitor in the studio
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