Continuity mistake: When Elmer Fudd realises that some of the elves are missing, his elf helper steps forward and you can see behind him are the other elves. When Elmer says "What shoemaker?" we return to the elf and the other elves who were behind him have disappeared.
Continuity mistake: When the shoemaker swats the elf, he has a fly swatter in his right hand. When the elf tells the shoemaker that he has been sent to take all the elves back, we return to the shoemaker and he is no longer holding the fly swatter.