At the start, when Jesse is driving the stolen Porsche to L.A, he is seen taking off his jacket. the next shot is a shot from behind, which shows him with his jacket still on. In the shot after that, he is seen continuing to take off his jacket.
After Monica puts on the pink dress and climbs into Jesse's car, they take off. As they're driving, they zoom over a hill in the road, and they are viewed from the back. You can see that Monica's necklace has become unfastened.