This is one of the few times Mel Blanc's real voice comes out in one of his cartoons. Granted, he's constantly shouting. The closest regular character to his real voice is Sylvester, with a bit less snarl and without the spitting.
This short got Chuck Jones in trouble as the use of the limited smudge animation wasn't considered the Warner Bros. style. Jones was fired, but for whatever reason (poor communication, Jones thinking his firing was a joke), Jones didn't leave Warner Bros Studios officially until 1964.