On the blue Mercedes 560 SL owned by Tiffany's dad, the windshield wipers in the close-ups of Tiffany and her dad are pointed away from each other. In a longer shot of the 560 SL pulling up to the troop meeting, they are both pointing to the driver's side of the car, which is the correct orientation for that car. I'm guessing the passenger-side wiper was taken off and aimed the "wrong" way in the close-ups because it might've obscured part of Tiffany's dad's face otherwise.