So, there I was on my couch this weekend-Tapping away on my beautiful new 14in MBP, booking a flight, when what do I hear? An intermittent creak/click/snap coming from my computer when I adjust it on my lap. And, of course, it's all I could hear for the rest of the day. Wasn't really reproducible, and truly intermittent.
Of course I was embarrassed by it bugging me as much as it did...but it made me NUTS.
I googled it, and looked here on the Mac Rumors forum, and to no surprise I found this thread. I found the discussion about loosening and retightening the bottom cover screws particularly interesting-so much so that I ordered a P5 screwdriver set from Amazon and it arrived this morning.
I didn't rotate the screws as discussed before, but instead figured I'd loosen and tighten them sequentially like you do when you change a flat tire. I was QUITE surprised to find a great deal of variability of the original factory tightness of the screws. I loosened them and tightened them to a fairly high hand tightness. Excepting for confirmation bias, the MBP chassis seems initially to be less (not) sqeaky.
I'll advise what I might find longer term, but I did want to thank you folks for your insight. Quite valuable.