I've not seen that episode, but I suspect it involved a blast of some sort. Having played high school football, I know it's not unusual to see a shoe knocked loose. Getting snagged by an open car door and dragged sideways seems like a perfectly plausible way to get your shoes pulled off. If the driver cut the wheel to the right (swinging the front of the car to the left), the left front tire might've helped pull his shoes off.
They have it all on film ~
But as I always say no bullet holes in the front windshield, nobody was trying to run you down!