When Melanie/Wanda is driving the blue Volvo through the desert and struggling about which direction to go, the device that makes the car do the spontaneous flip can clearly be seen on the bottom left side of the car, just in front of the rear left wheel.
When Wanda shops in the store for the resistance, she initially is wearing dark pants with pleats in the front. Later in the same scene she is wearing pants with no pleats, that are much lighter in color than the pair previously worn.
When the humans find Melanie in the desert, the soles on both her shoes are severely worn down in front. When she arrives at their hideout, a brief shot shows the sole on her left shoe to be completely unscathed.