Audio problem: After Sylvester gets a massive electric jolt by holding the cord, we cut back to Polly who now repeats, "Lights on." But the first time he says, "Lights on!", his beak does not move.
Continuity mistake: When Hippety Hopper breaks his crate apart on the rocks, you can see there are pieces of crate on the ground, but when we see Hippety in the next shot, the pieces have disappeared.