My driver's seat regularly makes a good snap sound when I lean into it (getting in and out of the car, repositioning in the seat). First time my daughter heard it from the back seat she thought a rock hit the windshield.
I just met with the dealership about the creaky driver's seat (and a few other things), and the tech was able to very clearly reproduce the creaks and snaps I complained about. I'd say I have a good case for a legit warranty claim there. Unfortunately they messed up the booking so I didn't have a loaner car available that day and I had to take my car back, then re-book the appointment for next week. They say they're going to get into the seat and see what's up, but from what I've read the seats are not designed to be disassembled. I suspect it's going to end up in an assembly replacement which is fine with me as I'll like to know if the new seat back also feels like the upper right bolster sticks out more than the left, but we'll have to see what happens.
On a related note, I hope they send me home with a Cruze while my Bolt is in for service because I'm going to be looking at the seat dimensions, mounting bracket design, and electrical connector VERY closely to see if by some miracle it can be swapped into the Bolt without too much difficulty.
Just FYI I'm 6'1", 200lbs.
Also I agree with wainair, I like to see people's location as it gives some meaningful context to their comments and opinions.