Elmer has a certain amount of mud on his clothes when he is standing at the bottom of the school stairs. He suddenly has more mud when he enters the school.
Elmer's close has more mud and he has smears of mud on his face, but when he was walking up the steps.
As the students are voting, it's stated that there are 25 kids in the school. However, in the shots that show the entire class, there's actually only 20.
When Laura and Mary are making campaign posters, they are using crayons. Crayons were not invented until 1903.