After Pinky meets Granny and they race the first time, she turns on the "supersonic rockets" and roars off, leaving Pinky and his car covered with soot. A few seconds later, Pinky and his car zoom away after Granny, shaking off the soot and leaving it in a pile on the road. But then the car is next shown in its original BLUE color as it whizzes off down the windy road and disappears around the bend --- evidently somebody in the art department momentarily forgot that Pinky had re-painted the car pink.
The panther's car had a windshield, but in one shot while racing the granny on the cliff side, it disappears.