A BSoD screen could display a QR code that encodes a URL at microsoft.com that unpacks all the data after the '?' in the URL, and provides an option to change culture and locale, including links to support pages known to be associated with that error, and a button to Bing-search for more information on the error. They could then copy-paste the URL for that page using their phone into a text or email to their favorite technical adept.

They actually do exactly that already! You can see the QR code right in OP's pic.

I meant that the QR code should be larger, to encode the additional information shown after the registry patch as additional URL parameters. On re-reading, I did not make that clear.

Nobody is decoding QR codes by hand, so it isn't that big a deal to go from "https :// www.windows.com / stopcode ? code=ACPI_BIOS_ERROR" to "https :// www.windows.com / stopcode ? code=ACPI_BIOS_ERROR & p1=0000000000000002 & p2=FFFF9A0..."

Ah, you're right. I didn't realize the bugcheck parameters weren't included in the code, that's definitely something which would be helpful. However then you still might run into the second problem of not being able to reliably render it in a crashing state. That's the only reason I could think why they would not include those parameters in the QR.