When the girls drop their pants hitchhiking to reveal the "WEST" painted on their behinds, when they are seen from the front, Bird is closest to the road, but when they are seen from behind, Mouse is closest to the road.
When the girls go into the diner, the kid behind the counter says the manager will be gone for a few hours. A few minutes later when the girls start dancing, he says the manager will be back any minute.
The 1973 Plymouth Fury Station Wagon that the girls hitch a ride in turns into a 1965 Ford Galaxie Woody Wagon for a few long shots, and with only the driver inside.