Audio problem: After the nightmare, Elmer rushes back to the log and pieces of his torn-up contract blow around in the air. At this point, you can see Bugs mouthing his catchphrase "Ehhh, what's up, doc?" but there is no sound.
Continuity mistake: When Elmer is chasing Bugs at the beginning of the cartoon, the ground is white, but when Bugs comes out of the log and pushes it over the cliff, the ground is green.