Continuity mistake: When Elmer says "That was the wabbit!" he picks up the spear in his right hand. But when he is chasing Bugs, he is holding the spear in his left hand, and when he sees Bugs on the horse, the spear is back in his right again.
When Elmer Fudd shouts "Smog!" whilst summoning the various forces of nature, he is voiced by Mel Blanc, not Arthur Q. Bryan. Blanc was chosen to do this line as his scream was considered to be better than Bryan's.