Nobody asked me but...
There are a number of issues, indeed.
-The shape of the breasts is quite unatural IMHO. Looks more like oversized breast implants (please don't ask for an example; Google Images will provide you the examples and I will not risk being punished by posting nudes here). The "oh, but its an unknown species and we don't know the anatomy" line is not a good way out, since we can compare with the breasts of known female bipedal (
Homo Sapiens) and non-bipedal apes (gorillas, orang-utangs, chmipanzees, bonobos). None of them have breasts that look like Pattys boobs IMHO.
-The location of the breasts is a bit strange; they seem to be too low in the chest when compared with known large apes. If the breasts were floppy (the Venus of Willendorf comes to mind), it would be OK, but they for me they seem quite rigid. For this I can present some relatively safe links:
http://myweb.dal.ca/mgoodyea/images/BreastpositionbyCupSize.gif http://en.wikipedia.org/wiki/Breast.
http://en.wikipedia.org/wiki/Tanner_stage
You can follow the links in Wikipedia's articles for more examples.
This is in stark contrast with Patterson's description. All it takes for one to see first-handed how Patty's breasts are unnatural is to go to the beach...
-Honestly, the breast movement I can see seems to be related/created by the subjects' torso twisting during the exagerated arms swings. The breasts seem to be spinning around a vertical axis (the vertebral column) instead of bouncing during the walk, as I would expect in natural breasts.
-The GIF also shows that the PGF resolution is quite poor; many (perhaps most) of the details pointed as "evidence" of Patty being a real animal are guesstimates at best. Of course, this is also valid for "evidence" such as zippers...