When Earl and Randy are sitting in The Crab Shack, Joy joins them with a pitcher from a blender. Before she falls over drunk, the pitcher moves from in front of her to in front of Randy and back again without being touched.
During one scene, Carl tells Earl to get the throttle plate. That would have been a smallish, flat, half-moon piece. What Earl gets is a spacer for the intake manifold.
When Earl shows up to Billy Ray's to race the Mustang against the El Camino, you can clearly see the lines of the bald skull cap that Billy Ray is wearing.