I,ve had the same problem. I think it started with the weather seal getting bumped loose when exiting the Z in a tight garage.
I,ve had to put the seal back on about 3 or 4 times and noticed the edge of the headliner coming loose. As long as the seal stays in place it appears to be okay.
I just got my car Wednesday and I have the same problem. Took it to the dealer today and after he spent a few minutes on it he ordered me a new headliner and left side weatherstripping. THE PARTS GUY TOLD ME THAT THEY HAVE CHANGED THE DESIGN OF THE WEATHERSTRIPPING AND THE NEW ONE WILL FIT BETTER! He also said it looks like my headliner was not properly molded. I don't know if he was pulling my chain or not, but he had no reason to lie. He said the adhesive only belongs in the corners so the part can move in temp changes.
Check it out with your dealers.
Hope this helps. I'll let you know how the repairs go.
I meant to say the rubber weatherstripping is glued in the corners only. I dont think the headliner is glued.(Might have a dallop or two to stop sagging but I don't know)
Leaving the car at the dealership....I always tell the dealer I don't want any miles put on the car, then I put a "Post-it" note with the mileage on the steering wheel.(Is this being too picky?) I've been lucky with my cars in the past at dealerships, no damage, but I've heard horror stories.
The driver's side window weatherstripping came loose the second day we had the car, has done it about three or four times since. I just tuck it back in and will live with it until I take the car to the dealer for the first visit.
I'll also have them align the tailpipes, since like so many others, the right side dips downward a bit.
Other than these two little piddly problems, the car is awesome and everything we expected. A rocket right out of the box!