When we first hear the road runner coming, Wile E. Coyote appears from behind the billboard that displays the title.
Story, Animation, Layouts, Backgrounds, and Musical Direction credits appear on the side of the truck that runs down Wile E. Coyote.
Director credit appears on the side of a crate that falls off the truck onto Wile E. Coyote.
The billboard with the main title has a tag at the top "Selzer Sign Services", which is an implied producer credit for Edward Selzer.
Coyote (Eatius Birdius)
Road Runner (Delicius Delicius)