I think I know what squeaking you're speaking of, but I don't think it's from the seat, as I thought it was.
I would hear it whenever I was getting out of the car, never into it, and it sounded like it was coming from outside the car.
I narrowed it down to the rear left wheel was making the squeaking noise when I got out of the vehicle. I even confirmed it be shaking the car in that section and it squeaked, but only does it under certain movements, more lateral movements of the vehicle (case in point only when I was leaving the vehicle) and not vertical movements, such as when I was sitting into the seat.
Not sure if it's the suspension or rim, but it wasn't anything serious and doesn't always happen. I chalked it up to heat expansion and the vehicle coming to a rest, as it only happened after I drove it and then parked and got out.
Not sure if that's the same sound you hear or not.