Ok, after a bit of playing around and the news that it should be possible, I've got it working. What's is strange because Display images below setting seems to stick even if you leave that mail and go back quite a while later, but never in the Entire message view.
Yet it seems that if you select Always display images from xxx then all images appear in the Entire message, which is what I was after.
Yeah, I'm seeing the same issue. The HTML is all there if you "show original". It appears to be a display issue. I'm told Google is working on a bug fix.
Temporarily, I'm just copying the html and sticking it in http://htmledit.squarefree.com so I can read it.
Best Answer
There is no way to disable clipping in Gmail, as per this rather new post on the Google Product Forum.
This web app in the Chrome store comes as recommended in the different posts:
Trimmless for Google Mail
Note: I'm not affiliated to the vendor of the app