Thx man.. are the screws next to the hinge supposed to be snug, but not tight?

I was looking at a black MB on display at Fry's and bookstore at my college, and noticed that the screws were also not tightened all the way down, but left some 'play' w/ the plastic when pressed down. So I'm guessing that's normal? Seems strange b/c I would think screws were meant to be tightened all the way down but it doesn't seem to be the case on the black MB.