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“multiple pixel size issues. That indicates a pieced together document.”

Old digital document management systems operated with an extreme restriction on image size. Never expecting anyone to mount legal challenges against simple standard forms and typed content down to the pixel level, the systems would scan the original, identify the parts deemed important (signatures), needed (typed and preprinted form text), and irrelevant (blank space, background noise), separate them by blocking out sections as needed, keep the important stuff at high quality high resolution high bit depth, downgrade the needed stuff to low resolution low (single) bit depth, and throw away the rest - all in accordance with what lawyers deemed necessary to recreate a legal duplicate of the original. They did not keep a complete >150 dpi >8 bit image of the entire document when storage space was precious. Then, when the document was needed, the software would paste all these pieces back together in a manner consistent with legal needs: all content was sufficiently clear, and sensitive stuff like signatures was of higher quality.

They never expected people would be arguing over the meaning of individual pixels in seemingly trivial parts of a then unremarkable BC.

Compare: if studying conspiratorial possibilities in the Kennedy assassination, one may get suspicious of a stray pixel in a H.264 reencoded copy of an MPEG1 compression of a DV transfer of a VHS recording of an NTSC broadcast of an SVHS copy of a 35mm print of a third-generation 8mm copy of the original Zapruder film. You can see how some things may be distorted along the way to the point of suspicion, especially by those unclear on how video transfer artifacts form and propagate. Screaming that a few odd pixels, easily explained by those who understand such things and confusing to those who don’t understand and don’t want to, constitute proof of conspiracy does not garner enough evidence or respect to get access to the original Zapruder film itself. Claiming that the copy made available to the public does not prove Kennedy’s brains were blown out that day proves one is an idiot.