Something about the shape of his eyes and all around that area made me think GSD when I first looked. The ears not standing up wouldn't necessarily be an indication that he didn't have some GSD in him. Some GSDs even sometimes have a little difficulty getting the ears to be erect. So, if he could have some GSD in him. But he could also have other things that we don't even see. Genetics are a funny thing. Chances are he has several things all mixed in there. Whatever he is, he's adorable. As far as being a little spooky, just be sure to get him out in the world to be introduced to all kinds of people, dressed differently, all kinds of environments and things. Actively associate good things (like tasty tid bits of food) with the things you want him to be comfortable with later in life. It has to happen a lot right now and keep on with socializing forever so he'll be confident and well adjusted. It sounds like he has pretty good "bounce-back" where he gets right over the thing he spooked at and then goes to investigate. That's good.
Best of luck. Can't wait to see him as he grows. He's really, really fluffy and cute. Congrats!