Continuity mistake: When Donald uses the jack to raise the hut onto his van, you can see the glass in the window is completely intact, but when he burrows under the hut a few shots later, the glass is now broken.
Continuity mistake: When Donald is at the front door of the hut and says "Come on out!" his position changes between shots.
Continuity mistake: When Donald is making a fire in the ground to get his three nephews out of their hut, you can see there is nothing next to the fire, but in the next shot a leaf has suddenly appeared.
Continuity mistake: When we see Donald's eyes peering behind the "School" sign at the beginning of the cartoon, you can see that there is nothing in front of the sign, but in the next shot two school books have suddenly appeared.