Factual error: In one scene Alvin is driving over a bridge on the Mississippi. He is going in to Prarie Du Chine but the bridge is in a different town, and he is going from east to west not west to east. The town he is driving into is Lansing, Iowa.
Other mistake: In the ending credits of this movie, it says "Cast (in order of appearance)" and the first character to be mentioned is Rose, whereas, in the beginning of the movie, Dorothy is the first one on the screen, and, the first person who talks.
Continuity mistake: After Alvin zooms down the hill with his tractor, Danny Riordan and four other people help him. In the shot of Alvin standing next to his tractor, the tractor is facing the right side of the house, in the next shot, from Alvin's perspective, the tractor is facing the left side of the house.
