While well-bred poodles of all sizes should be very square dogs, many of the minis and toys that come out of lines that aren't carefully bred to standard are long-bodied. Some pretty extremely so. It's fairly common to find a poodle out of a mill or commercial breeding situation that looks weirdly short-legged and unbalanced (for the breed) because of this, so I'd guess your boy just has some of that going on rather than being mixed with a genuine low-rider. Dogs like corgis, dachshunds, bassets, etc. have a form of dwarfism that's very distinctive and tends to be inherited very strongly in at least the first couple generations of cross breeding - that's not what looks like is going on here to me.
I'd guess the eyes are the same stories. Many foundation dogs for doodles aren't going to be excellent examples of their breed, since most people breeding very high quality purebreds don't want their dogs ending up in a breeding program for crossbreeds. While a looser eye like you've shown isn't something you see in 'ideal' examples of either breed, you can probably find some goldens or even poodles with looser skin around the face and eyes that can cause that. Regardless, it doesn't look anywhere near extreme enough to cause issues!
You won't know for sure unless you do a reliable DNA test, of course. My oldest boy has a similar story - I got him as a puppy from someone who bought him from a commercial doodle breeder. He's supposed to be all poodle, which he looks and acts the part enough for that to be the case, but he also has some physical traits that could either be because he wasn't bred to the poodle breed standard, or because he has cocker or something a couple generations back. Some day when we have a second income I might splurge on the Embark test to see which is the case!
For the record, I'm not at all against crossbreeding or outcrossing purebred dogs, nor am I against breeding dogs 'just' for being good pets/companions (that's a purpose too, and a very in-demand one in today's society). I just feel strongly that we should hold those breeding programs to the same standards that we hold a purebred breeder. No, there won't be a written standard for how the dog should look, but they can still be performing thorough testing for genetic health problems on the parents, having a clear goal for the temperament they're trying to produce, tracking lines for patterns in health and behavior, and 'proving' their breeding stock by showing they're successful in sports or work like being therapy animals. I hope to see the 'designer' dogs move more in this direction as people become increasingly aware of what a good breeder can do to improve the chances of getting a healthy, long-lived dog with a stable temperament.
