Continuity mistake: When the little dog pulls out the box containing a duck call whistle, he puts down his gun on the ground. When he and the big dog run off to find Lucky Ducky, the gun has disappeared.
Continuity mistake: When the big dog points his gun towards the hole in the log, the length of the log changes between shots.
Continuity mistake: After the ducks have flown away when the whistle has blown, there is a shot of the hunters in their boat and you can see the big dog is pointing his gun to the left. When the camera pans in on the hunters in the next shot, the big dog is now pointing his gun in front of him.