your post struck a nerve with me 'cause not only will this be my first mini, this will be my first car ever & I'm a woman so I'm real worried about being treated like a dummy & ripped off too.I used to do window display so I have put many, many decals on to many surfaces (glass,wood,metal,mirror) & it takes awhile to get the hang of it, it is very easy to make a mistake. And let me just say first off I don't know anything about tinted windows what & how they are made; BUT if it is basically the same thing; applying vinyl /plastic to glass, the only reason for there to be a " water bubble" is that the window was not properly dried before application...they missed a spot. And the only reason for there to be an air bubble is the decal was not properly applied & they chose to leave it.Again I've never tinted a window on a car this is just my experience working with decals. Definitely take a picture with the date, keep the receipt & go to another place that tints windows & ask them. Good luck.