When Herman is lying on his back in a large puddle of water, his back and arms are submerged. But when he stands up, his his back and arms are dry.
Herman's top wig moves shortly after being in a puddle on the ground and then flips forward.
when Herman pulls the traffic light out of the ground it doesn't have a base, but when he throws it in the bushes you see a large square base on it.
When Wilbur Kingsley holds up Herman's Operator's License the city is misspelled - it says "Hights".