Continuity mistake: In a close-up of the ACME Super Outfit, there are some small rocks by the box. When we see the Coyote in his outfit in the next shot, the rocks have disappeared.
Continuity mistake: When the Coyote has finished painting the tunnel on the rock face, the pots of paints have brushes in them. When we see the Coyote amazed after seeing the Road Runner running directly through it, the pots of paint beside him have no brushes.
Continuity mistake: When the Coyote picks up the knife and fork and starts running down the mountain, the knife and fork keep switching hands between shots.
Continuity mistake: When the coyote is tossing the boomerang up and down, his tail keeps disappearing and re-appearing.