Continuity mistake: After Donald has planted the dynamite in the anthill, he stops at an area and puts his fingers in his ears. At this point you can see there is nothing surrounding him, but when the dynamite explodes, there are now some small bushes and rocks around Donald.
Continuity mistake: When Donald comes out of his tent at the beginning, he is holding a coffee pot and a cup and puts them down on the picnic blanket. When we see the blanket after Donald has put on his napkin, the coffee pot and cup have disappeared.
Continuity mistake: When Donald puts down the teapot and cup on the picnic blanket after coming out of his tent, there is nothing in front of him. But after he has put on his napkin, a dish containing a spoon and a plate have suddenly appeared.