Hope this helps.
The drawings on Animal’s box are from some of the Muppet licensor art intended to demonstrate the correct ways to illustrate the characters. These aren't the puppet building instructions. Those designs are entirely different and are considered more of a trade secret.
These drawings do date back to Henson and I never really favored a lot of the drawn source material from their archives (with the exception of the Frith and Jim Henson conceptual art, of course). These drawings tend to be too cartoonish for my taste and needlessly erase much of what make the characters interesting and Muppety. I've seen good cartoon representations of the characters but they are rare.
The eye focus and jaw hinge placement were factory quality control issues that has the MR/Corgi team seeking a manufacturing source with better skills in the subtleties of Muppet building for Fozzie Bear. There are enough source images on Animal to have achieved a more accurate Animal, but it really depends on the factory.
The Henson Company has great committed, friendly folk, but they didn't keep the most comprehensive, organized records on their characters the way most other such companies would. Disney appears to be remedying this. They have a lot of thanks to give to Ken Lilly, the Palisades team and Muppet enthusiasts on this forum for helping out in recent years. Sometimes Disney has been a bit clumsy, but they are trying and more products are reflecting that.