Looks like you got a really good framing crew. I disagreed with the comments about Zip System, but, but with really good framing, you should be fine with what was used. Zip System is better, but I don't know if it's worth the extra cost in your situation or not.
For me, the first things I look for are properly sized headers and beams. If they cut corners there, then it's time to start looking closer at everything else. An Inspector told me once that when he goes to a job and he sees a mess everywhere, he's gonna look a lot closer to every detail. When he sees a clean, organized job, he just checks the basics because he's pretty sure they know what they are doing and it's going to be done right.
The last thing I wanted to see is how they sealed the windows. From what I can see in the pictures, they look like they used good tape. You'd be surprised how many builders don't seal their windows at all!!!!