MacBook Pro 16" hinge cracking sound
I own a 2019 MacBook Pro 16" and every time I open it the hinge on the left side (ESC key side) cracks or pops. I went to the apple store last week and tested the same models on display and both cracked. I tried opening and closing the 13" but it doesn't seem to have the same problem. I can only assume the weight of the screen on the 16" is causing the hinge's mounting points to flex. I found that if you close the screen while putting some pressure in the z-direction, it prevents that cracking sounds.
MacBook Pro (2020 and later)