Continuity mistake: After Cyborg is hit by the truck, he stands up and sees three Billy copies in the back of it. The one on the right has his arm behind the leg of the one in the middle. It then cuts to a close up and suddenly the one on the right has that same arm out waving at Cyborg. Also the box on the top left has dirt appear in the left corner below the lid.
Picture added by Quantom X