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Charlie,
A perceptive discovery, but
I don't believe that you've discovered a measuring error. Just a typographical error. You are correct that the metatarsal length indicated by the double-end arrow is approximately 55mm in the case of Rudy's bare footprint, instead of the "66.7mm" length in the illustration (and conjoined caption). Please see last link posted by Charlie,
http://www.friendsofamanda.org/footprint_measurements.html "66.7" should have read "55.7"
I presume that Rinaldi corrected this error in his court testimony, or perhaps the Rinaldi2.pdf file you linked is an earlier "draft" that was corrected, and so didn't appear in his final report.
Otherwise, Massei could have quickly dismissed any idea of Rudy being responsible for the bloody bathmat print, where the corresponding length on the bathmat was a mere 50mm. But Massei doesn't even mention this huge discrepancy! (See Massei MOTIVATION REPORT, English Translation, page 337.) Likewise, in Raffaele's APPEAL, summarized on Bruce's site, InjusticeInPerugia, I find no mention at all of this "measuring error." There was certainly a mistake. In my judgment a clerical mistake and so of no consequence.
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