I could honestly see that gag about the ass crack scratcher coming from a mile away. Then again, that could be based on an urban legend. I guess the animation's okay. I like the idea of Duck having a twin brother. He does look like him, only really fat. That would make a lot of difference.
There just should have been more jokes. I like the idea of new characters being introduced. These other characters aren't that interesting. You need to have more distinct voices. This is still completely harmless.