For the first Road Runner short Fast and Furry-ous (1949), the bird's "Beep! Beep!" was produced by special effects man Treg Brown with a Klaxon horn. When the gadget disappeared, Mel Blanc mimicked the sound for this short. Blanc's voice was used for all Road Runner cartoons thereafter. A sign at the entrance to the mine says "Selzer Mining Co." Edward Selzer was the film's producer.