When vacuuming glass, make sure you have good suction.
I kept finding peices of glass in every corner and crannie of my whole car: under the seats, on the sides of the back seats, in the seatbelt buckle, cupholders, ashtray, compartments in the doors, all along the edge of the door (obviously), around the shifter, in the hinges for the back of the front seats...
Yeah, I tilted the seat back and it make a nasty crunching sound. The whole thing must be covered with glass shards underneith.